Definition of “be (only) a matter of time” - English Dictionary

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“be (only) a matter of time” in British English

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be (only) a matter of time

C1 If it is (only) a matter of time until something happens, it is certain to happen but you do not know when it will happen:

It's only a matter of time before he's forced to resign.

(Definition of “be (only) a matter of time” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)