spare is a term used in bowling to indicate that all of the pins have been knocked down after the second ball of a frame.

A "spare" is awarded when no pins are left standing after the second ball of a frame; i.e., a player uses both balls of a frame to clear all ten pins. A player achieving a spare is awarded ten points, plus a bonus of whatever is scored with the next ball (only the first ball is counted). It is typically rendered as a slash on score sheets in place of the second pin count for a frame.

Frame 1, ball 1: 7 pins
Frame 1, ball 2: 3 pins (spare)
Frame 2, ball 1: 4 pins
Frame 2, ball 2: 2 pins
The total score from these throws is: 7 + 3 + 4(bonus) + 4 + 2 = 20
A player who bowls a spare in the tenth (final) frame is awarded one extra ball to allow for the bonus points.