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verb [intransitive] American English pronunciation: grumble /ˈɡrʌmb(ə)l/ 
Word Forms
present tense
present participlegrumbling
past tensegrumbled
past participlegrumbled

Related dictionary definitions

  1. 1
    to complain, especially continuously and about unimportant things
    grumble that:

    He grumbled that it was Saturday night and he didn't have a date.

    grumble about something:

    Children always grumble about school food.

    grumble at:

    She grumbles at her employees over the slightest thing.

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