Meaning

noun a support placed beneath or against something to keep it from shaking or falling

noun any movable articles or objects used on the set of a play or movie

noun a propeller that rotates to push against air

originFrom Middle English proppe (“a prop, support, support for a vine or plant”), from Middle Dutch proppe (“support, support for a vine, stopper for a bottle”). Compare Middle Low German proppe (“plug, stopper”), German Pfropfen (“plug”), Danish prop (“plug, stopper”).

Etymology from Wiktionary, CC BY-SA 3.0