The first recorded use of “when pigs fly” turns up in early 1600s English print, with close variants already poking fun at pigs growing wings.
You’ve seen it in chats, comments, and class notes: someone makes a bold promise, and you answer with a flying pig. It’s a clean way to say “not happening.”
People still want a real paper trail, not guesswork. That means looking at old print, not modern retellings. It also means being clear about what counts as “first.” A phrase can exist in speech long before a printer ever sets it in ink.
What “First Recorded Use” Means In Real Life
“First recorded” is about evidence, not invention. The earliest record we can point to is simply the oldest surviving, findable source that shows the wording (or a close form) in print.
Two details matter when you’re tracking a first record:
- Form: Is it the exact wording “when pigs fly,” or a longer proverb-like line that carries the same joke?
- Date: Is the date tied to a specific edition or document, not a vague claim?
Old sayings often start as longer lines. Over time, they get trimmed into the punchy version people repeat.
| Approx. era | Printed form | What it shows |
|---|---|---|
| 1500s | Flying-pig imagery in satire | Writers already used winged pigs as a comic “no chance” image. |
| Late 1500s | Long proverb-like pig-flight lines | Earlier “pig flight” sayings exist in fuller, wordier phrasing. |
| Early 1600s | Proverb lists and reference books | Printed collections start fixing the joke into a repeatable saying. |
| 1610s | “Pigs fly…” proverb wording | Shorter, cleaner phrasing appears in print around this period. |
| 1700s | “Pigs might/may fly” variants | The “might/may” pattern becomes a common reply format. |
| 1800s | Fiction uses the trimmed idiom | Novels and dialogue help spread it as a quick comeback. |
| 1900s–today | Modern “when pigs fly” idiom | Today’s phrasing is standard and widely understood. |
First Recorded Use Of When Pigs Fly In Print
If you mean the modern, trimmed comeback—just the phrase “when pigs fly” used to mean “never”—the best-supported trail points to early 1600s print, where proverb collections and older-style variants already carry the same punch.
One commonly cited early form is longer than the version people say now. Older print often adds extra detail, like tails and direction, because early proverb writing liked vivid phrasing. Later writers cut it down until it became the neat, four-word sting people repeat.
For a modern reference point on meaning and usage, you can check the Merriam-Webster “when pigs fly” entry. It gives the current sense in plain language and shows how the phrase behaves in a sentence.
Why Early Sources Don’t Always Match The Modern Wording
Older print is messy by modern standards. Spelling shifts, punctuation drifts, and writers love extra words. That’s normal. If you only search for the exact four-word phrase, you can miss the older “same idea” lines that paved the way.
That’s why researchers treat early variants as part of the same family. The core joke stays the same: pigs don’t fly, so the promised event won’t happen.
What To Say If You Need One Clean Date
When someone asks for a single “first recorded use” date, the safest answer is: early 1600s for printed evidence of the idiom family, with older, longer pig-flight lines appearing before the modern trimmed form settled in.
If you’re writing a report or lesson note, you can phrase it like this: “Printed sources in the early 1600s already use pig-flight sayings as a stand-in for ‘never,’ and the shorter ‘when pigs fly’ form grows from that stream.”
How The Phrase Works As A Reply
“When pigs fly” is a reply tool. It’s compact, it lands fast, and it carries a wink. It can be playful, or it can be sharp, based on your tone.
In conversation, it often shows up in three patterns:
- Standalone: “When pigs fly.”
- With a condition: “Sure, when pigs fly.”
- In a sentence: “He’ll clean his room when pigs fly.”
Those patterns matter if you’re teaching the phrase. They show that it’s not only a proverb in a book; it’s a working part of everyday English.
Meaning Without The Bite
Sometimes you want the meaning without sounding rude. You can soften it by adding a light tag: “When pigs fly, I guess,” or “When pigs fly—so I won’t plan on it.”
You can also swap in a calmer line: “I don’t see that happening,” or “I’m not counting on it.” Same message, less sting.
Why Pigs, Not Another Animal
Pigs are a strong pick for this joke because the mental picture is instant. A pig is solid, earthbound, and not built for flight. That contrast is the whole trick.
Old writing across Europe loved this kind of “impossible animal” image. The pig version stuck in English, while other languages kept their own homegrown versions (hens with teeth, crayfish that whistle, and so on). The point stays the same: the event is off the table.
Flying Pigs In Art And Satire
Even before the idiom settled into its modern form, winged pigs showed up as a comic device in satire and tall tales. That doesn’t prove the exact phrase existed then. It does show the image was already doing work for writers: it signaled absurdity at a glance.
This is one reason the idiom lasted. You don’t need a long explanation. The picture does the heavy lifting.
How To Verify The Earliest Record Yourself
If you want to check the trail with your own eyes, focus on two kinds of sources: scanned books and curated phrase histories. You’re looking for dated, citable pages, not recycled blog blurbs.
Try this process:
- Search for variants: Look up “pigs might fly,” “pigs may fly,” and longer proverb-style lines.
- Filter for scanned print: Prefer sources that show page images or clear edition details.
- Record the edition: Write down year, title, and page number where the line appears.
- Check phrasing: Note whether it’s the exact four-word phrase or a longer cousin.
If you want a readable overview that also points toward older roots, the Phrase Finder write-up on origin and usage is a solid starting point: Phrases.org “Pigs might fly / When pigs fly”.
What Counts As “Close Enough”
Close variants count when the meaning is the same and the image is the same. “Pigs might fly” and “when pigs fly” are essentially siblings. One is a snappy retort, the other is a time-based condition.
Still, if your assignment asks for the exact wording, say so. Then you can note that the idiom family shows up earlier in longer forms, and the shorter modern phrasing comes later.
Common Mix-Ups That Throw Off The Date
When people trade “first use” claims online, a few patterns cause trouble:
- Mixing imagery with idiom: A winged pig in a story is not the same thing as the idiom used as a reply.
- Using undated quotes: A quote without a verifiable edition date isn’t useful for a “first recorded” claim.
- Copying one blog chain: Many pages repeat the same line with no scan, no page, no edition.
The fix is simple: pick sources that show their work. A dictionary sense helps with meaning; a phrase-history site can help with early citations; scanned print nails the date.
Where The Modern Phrase Shows Up In Writing
Once the short form caught on, it started showing up in dialogue and opinionated writing, because it reads like spoken English. That’s also why it’s handy in teaching. Students can spot the tone shift the moment it appears.
| Use case | What it signals | Safer swap |
|---|---|---|
| Joking with friends | Playful disbelief | “Yeah, sure.” |
| Shutting down a claim | Hard “no” with edge | “I don’t agree.” |
| Refusing a plan | Not willing to commit | “I’m not planning on that.” |
| Calling out a habit | Skepticism based on past behavior | “I’ll believe it when I see it.” |
| Writing comedic dialogue | Character voice and timing | “As if.” |
| Soft sarcasm in an email | Dry pushback | “That’s unlikely.” |
How To Use The Phrase In A Sentence Without Sounding Mean
Because the phrase can sting, context matters. A quick trick is to aim it at situations, not at people. “That deadline will happen when pigs fly” hits softer than “You’ll do that when pigs fly.”
Another trick is to add a reason after it. A reason turns a jab into a point: “When pigs fly—there’s no budget for it this year.” That keeps it grounded.
Classroom Note For Students
If you’re teaching idioms, this one is useful because the image is literal and the meaning is figurative. Students can see the gap between the two right away. That helps them grasp how idioms carry meaning that isn’t tied to the words on the page.
Quick Recap You Can Cite In A Paper
If you need a neat sentence for a worksheet or short essay, here’s a clean, careful way to put it:
- The idiom family tied to pig-flight shows up in print by the early 1600s, and the shorter “when pigs fly” phrasing grows from older, longer variants.
And if you need to repeat the topic phrase inside your own writing for clarity, you can say it plainly: First Recorded Use Of When Pigs Fly points to early 1600s print evidence, not a guarantee of when people first said it out loud.
One last detail: the phrase keeps its bite because it stays short. Keep it that way in your own writing, and it will read like real speech, not a dusty proverb.