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English definition of “once bitten, twice shy”

once bitten, twice shy

said when you are frightened to do something again because you had an unpleasant experience doing it the first time Cautious and vigilantPaying attention and being careful Grammar:OnceOnce is an adverb or conjunction.Grammar:Once as an adverbWe use once as an adverb to mean ‘one single time’:Grammar:Once as a conjunctionWe use once as a conjunction meaning ‘as soon as’ or ‘after’:
(Definition of once bitten, twice shy from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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