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English definition of “mustn't grumble”

mustn't grumble

UK humorous
something you say to mean that your life is not bad and that you should not complain about it: "How's it going then, Mike?" "Oh, all right. Mustn't grumble."Accepting and agreeingAccepting and agreeing reluctantlyApproving and approval
(Definition of mustn't grumble from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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