1) American football terminology 2) Basketball terminology 3) Cheerleading area 4) Place for a benchwarmer 5) Rugby union terminology 6) Whence some moms are greeted 
The `sidelines` are the white or colored lines which mark the outer boundaries of a sports field, running parallel to each other and perpendicular to the goal lines. The sidelines are also where the coaching staff and players out of play operate during a game. The area outside the sidelines is said to be out of bounds. The term is predominantly .....
The areas along the sides of the field where coaches and non-participating players stand. Any player who runs to a sideline is deemed to be out of bounds, stopping the clock.
Hypothetical position referring to noninvolvement in a stock; merely watching.
Trading a security and an option on the same security on the same exchange.
[Basketball] 2 boundary lines that run the length of the court.
Also called touchlines. A ball that goes out of play over the sidelines is said to have gone into touch.