(idiomatic, intransitive) To play a subsidiary or subordinate role to someone or something else.

(UK, horseracing) To cut one's losses by betting on every racehorse other than the crowd favorite. / To have numerous romantic partners, without or before committing exclusively to one.

Used other than figuratively or idiomatically: see team, player. / (management) A person who can function effectively with others in a group, sharing information and striving towards a common goal.

Noticeably fake bills or coins intended for use as toy currency, especially with board games, rather than currency in a legitimate exchange market.

The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.

(mathematics) the locus of points in the Euclidean plane that satisfies some geometric or algebraic definition; a curve in a plane (as opposed to higher-dimensional space)

(mathematics) Two-dimensional Euclidean space.

A beam built of steel plates and shapes welded or bolted together to form a deep beam larger than could be produced by a rolling mill.

An unrefereed contest in which participants try to dominate each other without inflicting injury.

To engage in such a contest; to horseplay.