foul ball

US /ˈfaʊl bɔːl/
UK /ˈfaʊl bɔːl/
"foul ball" picture
1.

a baseball hit outside the lines of the first and third bases

:
The batter hit a foul ball, narrowly missing the fans in the stands.
It was a close game, but another foul ball meant the count remained the same.