This meaning refers to producing a deep, low, continuous sound expressing pain or another strong feeling.
The injured man moaned in pain.
The wind moaned through the trees.
This informal meaning refers to expressing dissatisfaction repeatedly or unnecessarily.
He is always moaning about the weather.
They moaned that the room was too small.
As a noun, moan refers to a low prolonged sound made by a person, animal, or natural force.
A quiet moan came from the next room.
The building made a strange moan in the wind.
