v. 1. or 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.
Meaning of POPUP in English
American idioms English vocabulary. Английский словарь американских идиом. 2012