Bob up and Drop in

Bob up verb - Originate or come into being.

Drop in and bob up are semantically related. in advance topic. In some cases you can use "Drop in" instead a verb "Bob up", when it comes to topics like come into sight, be present at, come to a destination.

Drop in verb - To make a brief visit.

Bob up and drop in are semantically related. Sometimes you can use "Bob up" instead a verb "Drop in".