UK, [US and ANZ] sideline [noun] [C] - one of the two lines marking the long edges of the area in which particular games, such as football, are playedThe linesman runs up and down the touchline.She spends her Saturday afternoons standing on the touchline, watching her boyfriend play rugby.
TOUCHLINE
Meaning of TOUCHLINE in English
Cambridge English vocab. Кембриджский английский словарь. 2012