an object placed under or against something to hold it in a particular position
2APTAMF [usually plural]
a small object such as a book, weapon etc, used by actors in a play or film:
Anna looks after costumes and props.
something or someone that helps you to feel strong:
She was becoming an emotional prop for him.
5 also prop forward
one of the players in a rugby team, who is large and strong and holds up the scrum