Open English Wordnet
Nouns
(n)walk-inperson who walks in without having an appointment“the emergency room was overrun with walk-ins” (n)walk-inan operative who initiates their own defection (usually to a hostile country) for political asylum (n)walk-in, waltzan assured victory (especially in an election) (n)walk-ina small room large enough to admit entrance Adjectives
(s)walk-in(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”