Meaning of “grumble” in the English Dictionary

"grumble" in British English

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(Definition of “grumble” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grumble" in American English

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grumbleverb [ I ]

us /ˈɡrʌm·bəl/

to complain in an annoyed way:

There’s no point in grumbling about the hotel – we’re only here for one night.

(Definition of “grumble” from the Cambridge Academic Content Dictionary © Cambridge University Press)