To close a window (typically by clicking a button marked with an X symbol).
To cross out with a series of the letter X, or with scribbles or lines.
To throw away, to reject.
To make a discard; to throw out a card.
To dismiss from employment, confidence, or favour; to discharge.
A temporary variable used to receive a value of no importance and unable to be read later.
Anything discarded.
A discarded playing card in a card game.