prop
Definitions
A pole, beam, or other object used to support something by holding it up.
A portable object other than furniture or costumes used on the set of a play or film.
To position something underneath or against an object to keep it in a desired place or upright.
Examples
The actor used a wooden sword as a prop during the rehearsal.
She used a heavy book to prop the door open so the breeze could enter.
The old fence was starting to lean, so we had to prop it up with a sturdy beam.