Fetching details from the dictionary...
groan; moan
growl; snarl; roar; howl; bellow
hum (e.g. of a motor); buzz; drone; wiz
device attached to a kite that makes a humming sound when the kite is flown
beat (acoustic interference)
痛みで思わず唸りが出た。
A groan escaped involuntarily from the pain.
怪我をした選手の唸りが聞こえた。
A groan from the injured player could be heard.
苦しそうな唸りを上げながらも立ち上がった。
He let out a pained groan but still got to his feet.