The sidelines in volleyball are the lines that make the shape of the volleyball court. If the ball goes over the sideline and the ball came from the other teams side it's best not to hit it because your team gets a point but let's say that someone in your team hit the ball but it went out the sidelines then you should pass it over the net so you don't lose a point.
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The sideline on a Basketball court is the line that marks where you meant to go. If you cross over it you go 'out of bounds'.