How do you spell propped as in propped up?

verb (used with object), propped, prop·ping. to support, or prevent from falling, with or as if with a prop (often followed by up): to prop an old fence; to prop up an unpopular government. to rest (a thing) against a support: He propped his cane against the wall.

What does mean propped?

propped; propping. Definition of prop (Entry 2 of 6) transitive verb. 1a : to support by placing something under or against —often used with up. b : to support by placing against something.