Wiktionary
vb. 1 (context transitive English) To support with, or as if with, a prop. 2 (context transitive idiomatic English) To be at the bottom of (a league)
WordNet
Usage examples of "prop up".
That well-stocked shop did not disappoint him, because it kept those items in stock for the many aging ships that had to use such underpinnings to prop up sagging decks.
He eased his fingers down over the right side of his abdomen and tried to prop up his liver.
We used a st prop up the front, and rocks or heavy bones that we found to w down around the edges.
It would certainly be impossible to prop up every bank that was mismanaged.
You could see a poor sunken hookwormy sharecropper in bib overalls trying to push a rusty plow through some eroded ground that was more gully than topsoil, aided by a mule with all his ribs showing, while off to one side the man's sallow hollow-socketed pellagra-ravaged wife with a swollen eight-month belly covered by a dress made from a fertilizer sack leans up against their shack to catch her breath or else to prop up the side wall.