the world > physical sensation > hearing and noise > voice or vocal sound > cry or shout (loudness) > cry of emotion or pain > [verb (intransitive)] > moan or groan (5)
intransitive. To breathe with a deep-toned murmur; to utter a low deep sound expressive of grief or pain.
intransitive ? To grunt or groan.
intransitive. To make a long, low, inarticulate sound indicative of mental or physical suffering or (in later use also) pleasure; to utter a moan…