Definition of “one swallow doesn't make a summer” - English Dictionary

british dictionary

“one swallow doesn't make a summer” in British English

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one swallow doesn't make a summer

saying

used to say that because one good thing has happened, it is not therefore certain that a situation is going to improve

(Definition of “one swallow doesn't make a summer” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)