Pop up - Idioms by The Free Dictionary
idioms.thefreedictionary.com › pop+uppop up 1. [for a baseball batter] to hit a baseball that goes high upward rather than outward. The catcher came to bat and popped up. I hope I don't pop up this time. 2. [for a baseball] to fly high upward rather than outward. The ball popped up and went foul. The ball will always pop up if you hit it in a certain way.