Wiktionary
vb. (context idiomatic intransitive English) To build up a supply of something, usually for use at a particular time in the future, when the time is right.
Usage examples of "store up".
Brittany may have made the supermarket off-limits, but the convenience store up by the highway was fair game.
Have you ever taken a sniff of those inadequately washed, worm-eaten sponges appended to pealing, yellow-rimmed slates, those sponges which somehow manage to store up all the effluvia of writing and 'rithmetic, all the sweat of squeaking, halting, slipping slate pencils moistened with saliva?
If we'd come from bees or ants, we might have planned out things ahead, or even if we had been trained like squirrels to store up nuts for the winter.
But they was spying around Possum Key maybe two years before that, they brung us turkeys, venison, and such, and we took their furs and bird plumes in to Storter's, got 'em trade goods, ordered a few guns from Colonel Wall's hardware store up in Port Tampa, and gave 'em a little cane liquor, too, to keep things lively.
Coming here, just walking over here tonight took everything I've managed to store up.
I would spend the night in Millen, store up a few hours' sleep, after the insistent demands of my appetite had been appeased, then on the morrow proceed comfortably on my way.
Locked the store up at the end of the day and disappeared off the face of the earth.
And no air, only soot that his lungs sought to store up by the pound.
He stores up rebuffs the way pirates were supposed to store up treasure .
With a whole city out there to draw on, vampire guests had no need to store up blood for an extra day or two.