walk-in

Definitions of walk-in
  1. noun
    a small room large enough to admit entrance
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    type of:
    room
    an area within a building enclosed by walls and floor and ceiling
  2. 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”
    Synonyms:
    deep
    having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination
  3. noun
    an assured victory (especially in an election)
    synonyms: waltz
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    type of:
    triumph, victory
    a successful ending of a struggle or contest
  4. noun
    person who walks in without having an appointment
  5. noun
    an operative who initiates his own defection (usually to a hostile country) for political asylum
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    type of:
    defector, deserter
    a person who abandons their duty (as on a military post)
    intelligence agent, intelligence officer, operative, secret agent
    a person secretly employed in espionage for a government
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