drop in = drop by = stop by

drop in = drop by = stop by (all inseparable/intransitive)=visit

1: There's Peter's house. Let's drop by and surprise him.

2: I don't think it's good idea to drop in without calling first.

1: I think it's OK to stop by.


similar expressions :

drop in at (a place) (inseparable/transitive)

drop in on (a person) (inseparable/transitive)

1: Let's drop in at Peter's house.

2: That's a good idea. It would be fun to drop in on him.


contrast : drop off =/= pick up (separable/transitive)

1: I have to drop my sweater off at the cleaners today so I can pick it up tomorrow.

2: I'll drop you off at the corner.


contrast :

drop out of (a place or activity) (inseparable/transitive)

drop out (inseparable/intransitive)

(be a) dropout


1: He dropped out of school last year and he still can't find a job.

2: He dropped out last year?

1: Yes, it's too bad. I never thought that he'd become a dropout.