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English definition of “sooner or later”

sooner or later

B2 used to say that you do not know exactly when something will happen , but you are certain that it will happen : Sooner or later she's going to realize what a mistake she's made.In the future and soon Grammar:SoonSoon means ‘a short time after now’ and ‘a short time after a point in the past’. Like many other short adverbs, we can use it in front position, mid position or end position, though we don’t use it in end position when referring to the past:
(Definition of sooner or later from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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