dropout

noun

• 1a person who has abandoned a course of study or who has rejected conventional society to pursue an alternative lifestyle:a college dropout

• 2 Rugby the restarting of play with a drop kick.

• 3a momentary loss of recorded audio signal or an error in reading data on a magnetic tape or disk, usually due to a flaw in the coating.

• 4 (usually dropouts) a U-shaped slot at the end of a fork or stay on a bicycle, made to receive the axle and enabling the wheel to be changed rapidly.