Once bitten, twice shy
An injury makes a person wary of its cause.
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Words nearby Once bitten, twice shy
Idioms and Phrases with Once bitten, twice shy
Once hurt, one is doubly cautious in the future, as in He was two days late last time, so she's not hiring him again—once bitten, twice shy. This seemingly old observation, presumably alluding to an animal biting someone, was first recorded in 1894.