a loud low dull continuous noise; "they heard the rumbling of thunder"大きくて低くて鈍い連続した騒音ゴロゴロいう音
make complaining remarks or noises under one's breath; "she grumbles when she feels overworked"不平を言うあるい小さな声で騒ぎ立てる愚痴る
to utter or emit low dull rumbling sounds; "he grumbled a rude response"; "Stones grumbled down the cliff"低く鈍いゴロゴロという音を発する、または出す唸る
show one's unhappiness or critical attitude; "He scolded about anything that he thought was wrong"; "We grumbled about the increased work load"人の不幸または批判的な態度を示す零す