How to sign: support by placing against something solid or rigid
"shore and buttress an old building";
Similiar / Same: prop up, shore up, shore
Categories: hold, hold up, support, sustain
Within this category: bolster
How to sign: any movable articles or objects used on the set of a play or movie
"before every scene he ran down his checklist of props";
Similiar / Same: property
Categories: object, physical object
Within this category: custard pie