Walk-on (noun)

1. A person who has a minor role in a play, film, or television program.
2. A person who participates in a sport as a non-scholarship player.

Origin:

Formed by combining the verb "walk" and the preposition "on".

Examples:

1. He was a walk-on in the movie.
2. She was a walk-on in the play.
3. He was a walk-on football player.
4. The walk-on only had a few lines in the play.
5. The walk-on was given a chance to play in the game.