For Keeps Meaning

(idiomatic) Permanently.

Example:   When we gamble at poker, we play for keeps.
2007 Dec. 7, "Steelers' Defense Anticipates Patriots Matchup," KDKA.com (Pittsburg):
  "We both got a job to do. They play for keeps and we play for keeps too," Haggans said.
1925 Aug. 10, "Golf: Shenecossett Invitation," Time:
  The Griswold trophy was presented to its winner, for keeps, since it was the third time she had won it.