1) An auxiliary activity 2) Auxiliary activity 3) Bench an athlete 4) Border in the court 5) Disable for a while 6) Extra job 7) Extra occupation 8) Knock out of the game 9) Line 10) Moonlighting 11) Out of bounds 12) Paying hobby 13) Place for second-stringers 14) Put out of action 15) Remove from play 1) Avocation 2) Hobby 3) Pastime 4) Touchline 
The two longer sides of a football or hurling pitch.
[Football] the boundary line that runs the length of the field along each side; a ball carrier or ball that touches or crosses the sideline is out of bounds.[Soccer] a line that runs along the length of the field on each side.
one of the lines marking each side of the field
[n] - a line that marks the side boundary of a playing field 2. [n] - an auxiliary line of merchandise
The boundary lines that separate the playing area from out-of-bounds on the side of the court.
out of bounds noun a line that marks the side boundary of a playing field