A ballpark figure is a rough guess at a number, close enough to work with. Give me a ballpark figure, just a ballpark figure, a ballpark figure will do.
Asking for one is a way of saying that precision is not wanted yet. It comes from American baseball, where being in the ballpark means being roughly right.
1phrasea ballpark figureA rough guess at a number, close enough to work with.
“Give me a ballpark figure and we can decide whether to go on.”
a ballpark figure is a phrase.
Also accepted in games: ballpark figure, ballpark
Practised in Idioms