(1):

(n.) A small apartment, or recess in the side of a room, for household utensils, clothing, etc.

(2):

(v. t.) To make into a closet for a secret interview.

(3):

(v. t.) To shut up in, or as in, a closet; to conceal.

(4):

(n.) A small room or apartment for retirement; a room for privacy.