first base

noun4

1. •
   The base after home plate in a counter-clockwise path around a baseball infield.

   • The runner took his lead off first base.
2. •
   Completion of the first phase of an activity.
3. •
   (US, informal) Kissing, regarded as the first phase of a sexual relationship.

   • I got to first base with Danny, and hope to get him naked this weekend.
4. •
   The betting spot located immediately to the left of the dealer, which is first to receive cards and first to act.