intransitive verb
Definition: To make a low sound of pain or discomfort, or to express sadness or dissatisfaction.
Example: He began to moan in pain after he fell.
noun
Definition: A long, low sound made when someone is in pain or feeling sad.
Example: I heard a moan coming from the other room, and it worried me.
transitive verb
Definition: To express sadness or discomfort by making low sounds, often in a way that shows pain or unhappiness.
Example: He moaned about the long wait at the airport.