IDIOMS

hold out

(transitive) To set something aside or save it for later.

Example: Used other than as an idiom: see hold,‎ out.
1883, Robert Louis Stevenson, Treasure Island
  I held out my hand, and the horrible, soft-spoken, eyeless creature gripped it in a moment like a vise. I was so much startled that I struggled to withdraw; but the blind man pulled me close up to him with a single action of his arm.
  I am holding out for more money.
  How long has he been holding out?
  How long can they hold out without water?
2011 September 2, “Wales 2-1 Montenegro”[1], BBC:
  Stevan Jovetic gave Montenegro hope when he unleashed a pile-driver but Wales held out for a much-needed win.
  You've got a key! Why have you been holding out on me?
  Pack the boxes, but hold out a few blue ones for later.