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To visit one casually and/or unexpectedly. Drop in whenever you want—I'll be home all day.
drop in(to) (something)
1. To let go of something so that it enters something else. In this usage, a noun or pronoun can be used between "drop" and "in" or "into." Oh, I just dropped my donation into the box outside.
2. To fall into something. Sean positioned himself so that the fly ball just dropped into his glove.
drop in (on someone)and drop in (to say hello)
to pay someone a casual visit, perhaps a surprise visit. I hate to drop in on people when they aren't expecting me. You're welcome to drop in at any time.
1. To let something fall into some other thing: I dropped some spare change in the beggar's cup. I took some rocks to the hole and dropped them in. Don't push the latch down into the lock; just let it drop in.
2. To come to some place for a casual visit: We'll drop in and see how you're doing tomorrow. Should we drop in on our neighbors tonight?