biān​xiàn

foul line

边线 (邊線) biān​xiàn
foul line noun
a boundary line used to determine if a ball is in or out of play in certain sports like baseball
sideline noun
the boundary line marking the side of a sports field or court

Frequency

Movie subtitles
0.830 per million appears in 0% of films
Written text
1.90 per million

Sources

Definitions
CC-CEDICT