adj.
1.(of e.g. closets or refrigerators) extending very far enough back to allow a person to enter walk-in n.
1.person who walks in without having an appointment
2.an operative who initiates his own defection (usually to a hostile country) for political asylum
3.an assured victory (especially in an election)
4.a small room large enough to admit entrance
Idiom of the Day
step in
to become involved or concerned with something, to enter a place for a brief time
The teacher had to step in and stop the fight between the two children.