A door that opens and closes by sliding to the side; sometimes one of a pair.

A regular, typical boy, as opposed to a superstar. / (gay slang) A young, attractive, slim male, usually having little body hair.

plural of girl next door

chad with two corners detached

(real estate) In Taiwan, a house with four doors, specifically a house with a garage, a garage door that connects to the home, a front door, and a back door.

plural of swinging-door chad

(slang, neologism) The person whose telephone number is the same as one's own, but with the final digit increased or decreased by 1; sometimes called as a prank or in an attempt to make friends.

plural of text door neighbour

(idiomatic) A redundant activity.

(idiomatic, management, politics) A policy or usual practice, by a person in authority, of permitting subordinates or constituents to visit his or her office unannounced and at any reasonable time for the purpose of discussing matters of concern.