ballpark figure
Quick translation: A rough estimate; an approximation.
A: Do you have an idea how much a pair of sneakers costs at the shop?
B: I don’t know exactly how much, but I can give you a ballpark figure.
A: 너 상점에 sneakers(신발 메이커) 한 짝이 얼마나 하는지 알고 있어?
B: 얼만지 정확하게는 모르겠어 그런데 대략적인 금액은 알려 줄 수 있지.
Possible interpretation: People sometimes make bets when they are in a ballpark where games are held. They need the odds to winning so they ask for an estimate or an approximation of what is likely to be the results of the game.