one-and-done

Noun

 * 1)  A basketball player who plays college basketball for a single year and then declares for the NBA draft.
 * John Calipari's Kentucky squad was made up of one-and-done players.
 * 1)  The act of a team making the postseason playoffs but losing the very first game played in it.
 * 2) A family in which the parents decide to have only one child.