To heat something after it has cooled off, especially previously cooked food (also in figurative senses).
To become hot again after having cooled off (also in figurative senses).
An afterburner.
To cook (food) by slowly boiling or simmering.
To brew (tea) for too long, so that the flavour becomes too strong.
To suffer under uncomfortably hot conditions.
To be in a state of elevated anxiety or anger.
A heated bath-room or steam-room; also, a hot bath.
A dish cooked by stewing.
A state of agitated excitement, worry, and/or confusion.
A steward or stewardess on an airplane or boat.
A pool in which fish are kept in preparation for eating.
An artificial bed of oysters.