prop

(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. Synonyms: property. Example: "Before every scene he ran down his checklist of props."

(noun) a propeller that rotates to push against air. Synonyms: airplane propeller, airscrew.

(verb) support by placing against something solid or rigid. Synonyms: prop up, shore up, shore. Example: "Shore and buttress an old building."