Definition of “take a rain check (on sth)” - English Dictionary

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“take a rain check (on sth)” in British English

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take a rain check (on sth)

informal

used to tell someone that you cannot accept an invitation now, but would like to do so at a later time:

Mind if I take a rain check on that drink? I have to work late tonight.

(Definition of “take a rain check (on sth)” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)