Definition of “mustn't grumble” - English Dictionary

british dictionary

“mustn't grumble” in British English

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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, not too bad. Mustn't grumble."

(Definition of “mustn't grumble” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)