walk-in
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Definitions
(noun) person who walks in without having an appointment. Example: "The emergency room was overrun with walk-ins."
Noun Definition 1
(noun) an operative who initiates his own defection (usually to a hostile country) for political asylum.
Noun Definition 2
(verb) enter by walking. Synonyms: walk in. Example: "She walks in at all hours, as if she lived here."
Verb Definition 1