Once bitten, twice shy — If you have been hurt or disappointed by someone or something in the past, you become more careful and reluctant to put yourself in the same position again. The phrase acknowledges that painful experience is a powerful teacher.
Meaning in Detail
At its core, “once bitten, twice shy” describes the cautious behaviour that follows a negative experience. When someone has been let down by a business deal, a relationship, a risky decision, or virtually any situation that went badly wrong, they naturally become more hesitant the next time a similar opportunity or threat arises. The idiom does not imply permanent timidity; rather, it recognises that a single bad outcome is enough to make a sensible person think twice.
In everyday speech, the phrase is most often used either to explain one’s own reluctance (“I won’t invest there again — once bitten, twice shy”) or to sympathise with someone else’s wariness (“Of course she’s nervous about dating again — once bitten, twice shy”). It sits in a neutral-to-informal register, at home in casual conversation, journalism, and informal business talk alike, though it is best avoided in formal academic or legal writing.
Origin & History
The expression grows from a simple, universal observation about animal behaviour: if a creature bites or stings you, common sense tells you to keep your distance the next time. The proverb was recorded in print as early as 1853, in Robert Surtees’s novel Sponge’s Sporting Tour, in the form “Warn’t I bitten once, and ain’t I shy twice?” Its plain logic made it an instant fixture in popular speech, and by the late nineteenth century it appeared regularly in British newspapers and novels.
Similar proverbs exist across many cultures, suggesting that the underlying idea is deeply human. The Latin phrase semel calcatus — “once kicked” — captures the same sentiment, as does the older English proverb “the burnt child dreads the fire”. In American English, the same idea is sometimes expressed through the longer saying “Fool me once, shame on you; fool me twice, shame on me.” Despite these parallels, the “once bitten” form has become the standard short idiom in modern British English.
Example Sentences
| Sentence | Context |
|---|---|
| I won’t invest in that company again — once bitten, twice shy. | Financial caution after a loss |
| She turned down the invitation to join another start-up; once bitten, twice shy after her last venture collapsed. | Career decision after failure |
| He always reads the small print on contracts now — once bitten, twice shy. | Legal caution from past experience |
How to Use It
The idiom works best when explaining a decision to step back, decline, or proceed with extra care in a situation that resembles a previous bad experience. It can be used in the first person (“I’m once bitten, twice shy about lending money to friends”), or as a standalone comment after a statement of refusal (“I won’t be booking that airline again — once bitten, twice shy”). It also works in the third person to explain or excuse someone else’s wariness without judgement.
Common Mistakes to Avoid
Once bitten, twice scared.
Once bitten, twice shy. — The fixed form uses “shy”, not “scared” or “careful”. Do not alter the wording.
I am once bit, twice shy about it.
I am once bitten, twice shy about it. — Use the past participle “bitten”, not the simple past “bit”.
Once bitten, twice shy, so I will try again immediately.
Once bitten, twice shy, so I will take my time before trying again. — The idiom implies caution, not complete avoidance or reckless re-entry; make sure the rest of the sentence is consistent with hesitancy.
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