Etymology
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walk-in (adj.)

1928, "without appointment," from the verbal phrase, from walk (v.) + in (adv.). As a noun, meaning "walk-in closet," by 1946.

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Definitions of walk-in
1
walk-in (n.)
person who walks in without having an appointment;
the emergency room was overrun with walk-ins
walk-in (n.)
an operative who initiates his own defection (usually to a hostile country) for political asylum;
walk-in (n.)
an assured victory (especially in an election);
Synonyms: waltz
walk-in (n.)
a small room large enough to admit entrance;
2
walk-in (adj.)
(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
From wordnet.princeton.edu