If you prop an object on or against something, you support it by putting something underneath it or by resting it somewhere.

A prop is a stick or other object that you use to support something.

To be a prop for a system, institution, or person means to be the main thing that keeps them strong or helps them survive.

The props in a play or film are all the objects or pieces of furniture that are used in it.

In rugby, a prop or prop forward is one of the two players who position themselves in the front row when a group called a scrum is formed.

A prop is the same as a propeller .