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groan; moan
growl; roar; snarl
hum (of a machine, power lines, etc.); drone (e.g. of an engine); buzz; howl (of the wind)
深夜に隣から唸り声が聞こえた。
I heard a groan from next door in the middle of the night.
老犬が眠りながら低い唸り声をもらしていた。
The old dog let out low moans in its sleep.
怪我をした選手が唸り声を上げてピッチに倒れた。
The injured player let out a groan and collapsed on the pitch.