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Verb: chunter  chún-tu(r)
Usage: Brit, informal
  1. Make complaining remarks or noises under one's breath
    "she chunters when she feels overworked";
    - murmur, mutter, grumble, croak, gnarl [archaic]

Derived forms: chuntered, chuntering, chunters

Type of: complain, kick [informal], kvetch [N. Amer, informal], moan, plain [archaic], sound off