tap out

Short definition from Wiktionary

Verb

1. 1
   To produce (a message, rhythm, or other thing) by tapping.
2. 2
   To submit to an opponent by tapping one's hand repeatedly either on the arena or the opponent's body.
3. 3
   To force (an opponent) to submit.
4. 4
   To relieve a person of duty, such as a casino worker or wrestler in a tag-team match.
5. 5
   To deplete, especially of a liquid; to finish the last of a drink.
6. 6
   To run out of money in a gambling establishment.