Meaning of “drop by/in” in the English Dictionary

british dictionary

"drop by/in" in British English

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drop by/in

informal
phrasal verb with drop uk /drɒp/ us /drɑːp/ verb -pp-

to visit someone:

I dropped in on George on my way home from school.
Drop by and pick up that book sometime.

(Definition of “drop by/in” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)