How Idioms Are Born (and Die)
Every post on this site is a single case study. This one is the manual. If you understand the five stages below, you can predict where most idioms come from before you look them up — and, more usefully, you can tell within about ten seconds whether an origin story you've been told is worth believing.
What's in here
- The five stages of an idiom's life
- Why the technology dies but the phrase doesn't
- Why fake origins spread faster than real ones
- How to research any idiom yourself
- Where to start in the jar
The five stages
A literal practice exists
Nearly every idiom starts as a real thing real people did. Not a metaphor, not a joke — a job. Ports paid men to smash harbour ice. Butchers hung carcasses from a beam. Boxing rounds ended with a bell. Sailors sent seasick crew below the weather rail. The phrase is at this stage merely a description.
Watch it happen: break the ice · under the weather · kick the bucket
Someone uses it figuratively
A speaker applies the literal image to an unrelated situation, and it lands. This is the actual moment of coinage, and it's almost always invisible — spoken, not written. When we do catch it in print, it's usually because a famous writer or a newspaper happened to be nearby: Thomas North in 1579, Kipling in 1891, Ogden Nash in 1936, a mother's telegram in 1906.
Watch it happen: bite the bullet · bring home the bacon · piece of cake
A community adopts it
The phrase spreads through a group that shares the reference — soldiers, sailors, printers, gamblers, film crews, office workers. This is why idioms cluster by industry: the group is the incubator. Notice how many workplace phrases come from baseball, or how many "everything" phrases come from gambling.
Watch it happen: cut to the chase · 9 office phrases · break the bank
It escapes and generalizes
The phrase leaves its home community, and its meaning loosens. "Deadline" stops meaning a fatal boundary and starts meaning Friday. "Break the ice" narrows from "any first difficult step" to specifically social awkwardness. Meanings drift both ways — widening, narrowing, softening — and this drift is normal, not decay.
Watch it happen: deadline · spill the beans · curiosity killed the cat
It fossilizes — or dies
Eventually the original practice disappears. Two things can happen. Either the phrase dies with it (English has lost thousands of idioms about horses, hats, and hand-copying that nobody now recognises), or it fossilizes: the words survive as a single unit of meaning, the picture inside them goes dark, and speakers use it fluently without decoding it. That fossil is what we dig up.
Watch it happen: hold your horses · mad as a hatter · 10 fossils you use daily
Why the technology dies but the phrase doesn't
The single most useful rule in this whole business: an idiom survives on the feeling it names, not the object it describes. Nobody has bitten a bullet for medical reasons in over a century, and nobody holds horses, and no one is being shot for crossing a prison camp's dead line. But dread, impatience and time pressure are permanent human weather.
This is also why idioms are such good historical evidence. They preserve what mattered to ordinary working people — not what historians thought was important, but what came up often enough at work to need a shorthand. A language's idiom stock is a map of its speakers' daily lives, several centuries out of date.
Why fake origins spread faster than real ones
Now the uncomfortable part. Look at the five stages again and notice what they are: a process. Slow, communal, undated, with no single author and no punchline. Now consider the shape of a typical fake origin — a specific scene, a named culprit, a moment of revelation, ideally an injustice. That's a story.
Human memory is built for stories and hostile to processes. So when someone asks where a phrase comes from, "American slang drifted between related senses over about a decade" loses every single time to "there was a law about the thickness of sticks." The fake version isn't spread by liars; it's spread by people who remembered the memorable thing.
Two extra accelerants. First, bundling — myths travel in packs, so the coffin-bell story arrives beside two more fake origins and they appear to corroborate each other. Second, the acronym instinct: modern speakers assume old phrases work like modern initialisms, which produces "Port Out Starboard Home" and its many cousins, none of them real.
How to research any idiom yourself
- Hunt the earliest dated citation, not the best story. The question is never "does this explanation make sense?" — invented ones always do. The question is "what's the oldest printed use, and what did it mean there?"
- Use historical dictionaries. The Oxford English Dictionary is the gold standard for dated quotations; Etymonline is free and excellent for word histories; the Phrase Finder specializes in phrases.
- Search newspaper archives. Digitization has rewritten etymology in the past twenty years — the Library of Congress Chronicling America collection is free, and it's exactly the kind of source that overturned the whole-nine-yards consensus.
- Apply the gap test. If the claimed origin is medieval and the first citation is 1908, the silence is the answer. Real phrases leave traces.
- Be willing to end at "unknown." The most honest result in etymology is a shrug with sources attached. It's also, we'd argue, the most interesting.
Where to start in the jar
If you want to see all five stages in one clean example, read break the ice — literal practice, figurative use in 1579, community spread via Shakespeare, generalization to small talk, and total fossilization today.
If you'd rather see the machinery fail spectacularly, go to 7 fake idiom origins, then the whole nine yards for an honest unsolved case. And if you just want the fun stuff, the Weird Histories shelf is where the jar keeps its strangest specimens — while idioms English should steal shows the process still running in other languages, right now.
Quick FAQ
How are idioms created?
A literal practice gets used figuratively by people who know it, spreads through their community, generalizes, and finally outlives the practice — becoming a phrase nobody has to decode.
Why do they survive after the practice disappears?
Because they name a permanent feeling rather than a temporary technology. Dread and impatience never went obsolete.
How do I research one myself?
Find the earliest dated citation using the OED, Etymonline, the Phrase Finder and digitized newspaper archives — and distrust undated claims and acronym stories.
Are new idioms still forming?
Constantly. "Like herding cats" is from the 1980s–90s, and the internet produces candidates yearly. Most fade; a few fossilize for centuries.
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The IdiomJar team researches phrase origins from dictionaries, digitized newspaper archives, and the work of etymologists — and clearly labels anything that's folklore rather than fact. Read more about how we work.