“Side by side” means placed next to each other or shown in parallel so you can compare two things quickly.
You’ve probably typed side by side define into a search box because you wanted a plain meaning, not a grammar lecture. Fair. This phrase looks simple, yet it causes a bunch of tiny writing snags: hyphen or no hyphen, adverb or adjective, “next to” vs “side by side,” and where it sounds natural in school work.
This page gives you the definition, shows you the clean patterns, and helps you avoid the usual slips in essays, captions, and reports.
Side By Side Define In Plain English
Side by side means two things are next to each other, or two things are shown together in a parallel layout so differences stand out. In normal writing, it’s about placement, layout, or close positioning that the reader can picture.
| Meaning Or Form | When It Fits | Sample Sentence |
|---|---|---|
| side by side (placement) | Two items are next to each other | The chairs sat side by side near the window. |
| side by side (comparison layout) | Two items shown together for contrast | Put the graphs side by side to spot the trend. |
| work side by side | People working close together | New staff work side by side with a mentor for the first week. |
| live side by side | Groups sharing a place over time | Two languages can live side by side in one city. |
| side-by-side (adjective) | Right before a noun | We built a side-by-side comparison chart. |
| side-by-side photos | Two images presented together | The report includes side-by-side photos from day one and day seven. |
| side-by-side view | UI label for two panes | Switch to a side-by-side view to review edits faster. |
| side by side on one page | Formatting instruction | Place both quotes side by side on one page, then annotate them. |
What “Side By Side” Means In Everyday Writing
Most of the time, “side by side” answers a simple question: where are the things, or how are they arranged? That’s why you’ll see it in photo captions, classroom prompts, and layout notes.
Two common senses cover almost everything you’ll meet:
- Next to each other in space: two people walking together, two boxes on a shelf, two seats in a row.
- Next to each other on the page or screen: two charts, two paragraphs, two versions of a file, shown in parallel.
That second sense is gold for comparison tasks. When you place items side by side, you’re telling the reader the layout helps them compare without flipping pages or scrolling back and forth.
Fast check you can do in your head
Try swapping in “next to each other.” If the sentence keeps the same meaning, you’re using the placement sense. If “in parallel” works better, you’re using the comparison-layout sense.
Hyphen Or No Hyphen
Here’s the clean rule: hyphenate it when it sits right before a noun. Keep it open (no hyphen) when it acts like an adverb phrase after the verb.
- They stood side by side. (adverb phrase)
- They made a side-by-side chart. (adjective)
Why the hyphen? It tells the reader to treat “side” + “by” + “side” as one modifier that belongs together.
What reputable dictionaries show
Cambridge defines the phrase as “next to each other” on its Cambridge Dictionary “side by side” page. Merriam-Webster lists it as an adverb meaning “beside one another,” and also notes the hyphenated adjective form on its Merriam-Webster “side by side” entry.
Parts Of Speech You’ll See
“Side by side” is flexible. It shows up as an adverb phrase in most sentences, then as an adjective when it modifies a noun.
Adverb phrase
This is the most common pattern. It modifies the verb and tells how something is positioned or presented.
- The folders lay side by side on the desk.
- We read the two passages side by side, then marked the shared themes.
- The students sat side by side during the assembly.
Adjective (hyphenated)
When the phrase comes right before a noun, the hyphen keeps it tidy.
- A side-by-side layout makes grading faster.
- Print a side-by-side transcript for checking line breaks.
- The tool offers a side-by-side preview.
UI labels and feature names
Software menus often treat it like a feature name: “side-by-side view,” “side-by-side mode,” “side-by-side compare.” When you write instructions, match the product’s spelling and stick with it throughout the page.
Where Writers Mess It Up
Most mistakes come from mixing the open form and hyphenated form, or adding extra words that don’t belong.
Slip 1: Missing hyphen before a noun
“Side by side comparison” can look unfinished, since “comparison” is the noun being modified. In that spot, the hyphen is your friend: “side-by-side comparison.”
Slip 2: Hyphenating the adverb phrase
“They stood side-by-side” shows up online, and people will still understand it. In formal writing, the open form is the safer pick after a verb: “They stood side by side.”
Slip 3: Adding extra glue words
You don’t need “each other” after “side by side.” You also don’t need “with” in many sentences. “Put the photos side by side” already says what you mean.
Sentence Patterns You Can Copy
When you’re writing fast, templates save time. These patterns work in essays, reports, captions, and classroom handouts.
Placement (physical objects)
- Place [Item A] and [Item B] side by side to check the sizes.
- The labels sit side by side on the front panel.
- Line the books side by side by author name.
Comparison (charts, quotes, versions)
- The slide shows a side-by-side comparison of [Topic 1] and [Topic 2].
- Put the two graphs side by side so the slope change is easier to spot.
- The worksheet prints side-by-side samples of strong and weak topic sentences.
Shared place or time
- Older rules and newer rules can sit side by side in one handbook.
- Two teams worked side by side during the event.
- Different traditions can live side by side in the same neighborhood.
Side By Side Define Versus Similar Phrases
English has a cluster of nearby options. Picking the right one can make your sentence sharper.
Beside
“Beside” is a single preposition. It often reads smoother in short sentences: “She sat beside her friend.” Use it when you don’t need the paired, aligned feel that “side by side” adds.
Next to
“Next to” is close in meaning, yet it can sound more casual. “Side by side” can sound more deliberate, like you placed two things on purpose to match or compare.
Alongside
“Alongside” can mean physical closeness, and it can also mean “together with” in a broader sense: “Training runs alongside class time.” It’s handy when you mean parallel activities, not only physical placement.
Adjacent
“Adjacent” is precise and formal. It fits technical writing: “The adjacent columns share a header.” In basic school writing, “next to” or “side by side” often feels clearer.
How To Write Better Comparisons In School Work
Teachers often ask students to place ideas side by side and compare them. The phrase is useful, yet you don’t want to repeat it in every line.
Write it once, then switch wording
Start with a layout instruction: “Put the two quotes side by side.” After that, refer to them as “both quotes,” “each author,” “the two speakers,” or “the two passages.” It keeps the paragraph moving.
Name the comparison axis
Comparison gets clearer when you name what you’re comparing: tone, word choice, evidence, structure, timing, or point of view. “Set the claims side by side” is a start. “Set the claims side by side by evidence type” turns it into an action the reader can complete.
Keep balance
When two ideas go side by side, give them equal space. A simple trick: write one point about the first item, then mirror the sentence shape for the second item. That symmetry makes the comparison easy to follow.
Writing Tips For Captions, Slides, And Reports
“Side by side” shows up a lot in captions and slide decks because layout matters. These tips keep your wording clean.
Pair it with a reason
Readers like knowing why the layout matters. Add a short, concrete reason: “Show the drafts side by side to check spacing,” or “Place the maps side by side to compare scale.”
Pick a strong verb
“Put” works, yet stronger verbs can be cleaner: “align,” “pair,” “match,” “compare,” “stack,” “place.” A good verb can cut extra words and keep the sentence crisp.
Don’t let it float
A common caption slip is starting with “Side by side,” then never naming what’s side by side. Captions read better when the subject comes first: “The two samples sit side by side,” or “These photos appear side by side.”
Common Mistakes And Clean Fixes
This table shows frequent slips and a quick repair you can apply right away.
| Slip | What’s Off | Clean Fix |
|---|---|---|
| side by side comparison | Missing hyphen before a noun | side-by-side comparison |
| side-by-side they stood | Hyphenated form used after a verb | They stood side by side |
| put them side by side each other | Extra words add clutter | put them side by side |
| place it beside by side | Mixed structures | place it side by side |
| side by side with | “with” is often extra | side by side |
| two charts side by side compares | Verb form doesn’t match | two charts side by side compare |
| side by side, the data is clear | Dangling opener | With the data side by side, the pattern is clear |
Mini Checklist Before You Submit
- Does “side by side” point to real placement or parallel display? If yes, keep it.
- Is it right before a noun? If yes, hyphenate: side-by-side.
- Is it after a verb? If yes, keep it open: side by side.
- Did you repeat it too often? Swap in “beside,” “next to,” or a stronger verb in a few lines.
- Read the sentence out loud. If it sounds clunky, trim extra words first.
Closing Note
If you came here because side by side define felt confusing, keep the core meaning in mind: “next to each other” or “shown in parallel.” Then choose the form that matches the job in your sentence. That’s it.
One more time in plain lowercase, since it matters for writing: side by side is usually open after a verb, and side-by-side is usually hyphenated before a noun.