Definitions from Wiktionary (drop in)

▸ verb:  Used other than figuratively or idiomatically: see drop, in.
▸ verb:  (idiomatic) To arrive casually and unannounced, with little or no warning; also, to visit without an appointment.
▸ verb:  (surfing, intransitive) To paddle into and take off on a wave another surfer is already riding.
▸ verb:  (intransitive) To fall in; to cave in.
▸ verb:  (transitive, US) To install components, particularly car engines.
▸ noun:  Alternative spelling of drop-in. [One who casually drops in (visits unannounced or without appointment).]
▸ Also see drop_in


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