noun
(sports) A student athlete who wants to try out for a college sports or athletic team without the benefit of a scholarship or having been recruited.
(theater, film) An actor of a small (or "bit") part in a theatrical production or film, often without speaking lines.
(chiefly attributive) Such a part in a play or film.
One who arrives and boards transport (such as a train or ferry) without having booked in advance.
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