a piece of wood, metal, etc. used to support something or keep it in position

a person or thing that gives help or support to somebody/something that is weak

After being the emotional prop he needed for so long, she dared not leave him.

Many people use alcohol as a social prop.

a small object used by actors during the performance of a play or in a film

He is responsible for all the stage props and lighting.

a player on either side of the front row of a scrum

to support an object by leaning it against something, or putting something under it, etc.; to support a person in the same way

LEARNit Dictionary