walk-in

Adjective

• (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
    

Noun

• a small room large enough to admit entrance

• an assured victory (especially in an election)

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

• person who walks in without having an appointment
  • the emergency room was overrun with walk-ins
    

Related words

• Synonyms: 
  walk-in(a) , waltz