one-and-done

noun4

1. •
   (informal) Something that is completed or accomplished only once, never to be done again.
2. •
   (US, informal) The act of a team making the postseason playoffs but losing the very first game played in it.
3. •
   (slang) 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.
4. •
   A family in which the parents decide to have only one child.