one-and-done

Short definition from Wiktionary

Noun

1. 1
   A basketball player who plays college basketball for a single year and then declares for the NBA draft.
2. 2
   The act of a team making the postseason playoffs but losing the very first game played in it.
3. 3
   A family in which the parents decide to have only one child.
4. 4
   Alternative form of one-and-done.