foot fault

US /ˈfʊt fɔːlt/
UK /ˈfʊt fɔːlt/
"foot fault" picture
1.

脚误

an instance of a player serving in tennis or volleyball touching or crossing the baseline with their foot before hitting the ball

:
The umpire called a foot fault on the player, costing them the point.
裁判判罚该选手脚误,使其失去一分。
To avoid a foot fault, make sure your feet stay behind the line when serving.
为避免脚误,发球时请确保双脚保持在底线后方。