请问词组“顺便拜访”用英文怎么说?

“drop in”,或“stop by”都可以用。

I happened to pass by,so I dropped in.
我刚巧路过，顺便拜访您。

drop in 顺便走访(某人)
Drop in and see us when you're next in London.
到伦敦时顺便来看我。

go by
run in
stop by
stop in
这些都可以表达这样的意思

come over

BY DROP

drop in call on