noun / verb
moan
MOHN/məʊn/
A low prolonged vocal expression of feeling.
The woman moans softly in pain as her companion listens closely.

Etymology
Middle English monen meant to mourn or bewail. Through the sense of lamenting without words, it came to describe the low sound expressing suffering, rather than the act of mourning itself.
In context
But as he spoke he heard her moan, and the soft thud of her little body
More examples
- He lets out a low moan as he bends his injured knee.
- She moans with pleasure as the massage loosens her shoulders.
- The kids moan about having to clean their rooms.
Forms
moan · moans · moaned · moaning