spare

The act of sparing; moderation; restraint.

Parsimony; frugal use.

An opening in a petticoat or gown; a placket.

That which has not been used or expended.

A spare part, especially a spare tire.

A superfluous or second-best person, specially (in a dynastic context) in the phrase "An heir and a spare".

The right of bowling again at a full set of pins, after having knocked all the pins down in less than three bowls. If all the pins are knocked down in one bowl it is a double spare; in two bowls, a single spare.

The act of knocking down all remaining pins in second ball of a frame; this entitles the pins knocked down on the next ball to be added to the score for that frame.

A free period; a block of school during which one does not have a class.