Langtolang Multilingual Dictionary

a loud low dull continuous noise

• “they heard the rumbling of thunder”

a complaint uttered in a low and indistinct tone

show one's unhappiness or critical attitude

• “He scolded about anything that he thought was wrong”
• “We grumbled about the increased work load”

make complaining remarks or noises under one's breath

• “she grumbles when she feels overworked”

to utter or emit low dull rumbling sounds

• “he grumbled a rude response”
• “Stones grumbled down the cliff”

make a low noise

• “rumbling thunder”