bob up phrasal verb

1. to come to the surface suddenly
   • ● The dark head of a seal bobbed up a few yards away.

[TahlilGaran] English Dictionary ▲

bob up
To appear suddenly or unexpectedly; show up; come out.
Just when the coach thought he had everything under control, a new problem bobbed up.

After no one had heard from him for years, John popped up in town again.

2. To hit a pop fly in baseball.
Jim popped the pitch up.

See: POP UP(1).

[TahlilGaran] English Idioms Dictionary ▲