drop in on (someone)

To visit one casually or unexpectedly. Ever since we gave your mother that key, she keeps dropping in on us. Sure, you can drop in on me while you're in town. I'd love to catch up! Sorry I'm late, my neighbor dropped in on me as I was getting ready to leave.

See also: drop, on

See also:

drop in to say hello
drop in(to) (something)
drop in
drop over
drop in for a chat
lob (in)
lob
chat about
chat about (someone or something)
toss around (one's) name

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