To rest one's head on a pillow or other object; to use as a pillow; (literary) to border or lean against.

(bound form) an ancient Chinese weapon consisting of a long handle and a horizontal blade; by extension, weapons in general

(bound form) to sleep; to lie down to rest; relating to sleep as in 寝室 qǐn​shì or 寝具 qǐn​jù

(bound form) Body armor or a protective vest made of leather or metal plates worn by soldiers in ancient times