definition of
prop

[1] #1 prop n. a support placed beneath or against something to keep it from shaking or falling. wn

[2] #2 prop v. [prop up, shore up, shore] support by placing against something solid or rigid; "shore and buttress an old building". wn

[3] #3 prop n. [property] any movable articles or objects used on the set of a play or movie; "before every scene he ran down his checklist of props". wn

[4] #4 prop n. [airplane propeller, airscrew] a propeller that rotates to push against air. wn