GRUMBLE — СИНОНІМІЯ

grumble a complaint uttered in a low and indistinct tone

WordNet

grumble a loud low dull continuous noise

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grumble make complaining remarks or noises under one''s breath

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grumble show one''s unhappiness or critical attitude

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grumble to utter or emit low dull rumbling sounds

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grumble make a low noise

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