The main tower of a castle or fortress, located within the castle walls.

The food or money required to keep someone alive and healthy; one's support, maintenance.

“He works as a cobbler's apprentice for his keep.”

The act or office of keeping; custody; guard; care; heed; charge; notice.

To continue in (a course or mode of action); not to intermit or fall from; to uphold or maintain.

“to keep silence;  to keep one's word;  to keep possession”

(heading) To hold the status of something.

(heading) To hold or be held in a state.