What's the noun for fouling? Here's the word you're looking for.
foul
(sports) A breach of the rules of a game, especially one involving inappropriate contact with an opposing player in order to gain an advantage; for example, tripping someone up in soccer, or contact of any kind in basketball.
(bowling) A (usually accidental) contact between a bowler and the lane before the bowler has released the ball.
(baseball) A foul ball, a ball which has been hit outside of the base lines.