prop

An object placed against or under another, to support it; anything that supports.

"They stuck a block of wood under it as a prop."

The player on either side of the hooker in a scrum.

One of the seashells in the game of props.

(sometimes figurative) To support or shore up something.

"Try using a phone book to prop up the table where the foot is missing."

To play rugby in the prop position

(usually with "up" - see prop up) To position the feet of (a person) while sitting, lying down, or reclining so that the knees are elevated at a higher level.