prop1 past tense and past participle propped, present participle propping [transitive always + adverb/preposition]
prop something against/on something
He propped his bike against a tree.
Can we prop the window open with something?
prop something ↔ upphrasal verb
to prevent something from falling by putting something against it or under it:
The builders are trying to prop up the crumbling walls of the church.
prop something ↔ up against
paintings propped up against the wall
to help an economy, industry, or government so that it can continue to exist, especially by giving money:
The government introduced measures to prop up the stock market.