grumble - definition and synonyms

noun 

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/ˈɡrʌmb(ə)l/
singulargrumble
pluralgrumbles
  1. 1
    [countable] a minor complaint about something

    My only grumble is that the system is a bit slow.

  2. 2
    [uncountable] a low continuous sound

    the grumble of water pipes