walk-in

An assured victory (especially in an election).

An operative who initiates his own defection (usually to a hostile country) for political asylum.

A small room large enough to admit entrance.

Person who walks in without having an appointment.

“the emergency room was overrun with walk-ins”

Enter by walking.

(of e.g. closets or refrigerators) extending very far enough back to allow a person to enter.

“a deep walk-in refrigerator”

“walk-in closets”