Bob up and Pull in

Bob up verb - Originate or come into being.

Pull in and bob up are semantically related. in come to a destination topic. In some cases you can use "Pull in" instead a verb "Bob up".

Pull in verb - To keep from exceeding a desirable degree or level (as of expression).

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