stopper

A device, such as a cork or plug, that is inserted to close an opening.

One that causes something to stop.

A card or cards enabling one to prevent one’s opponents from winning all the tricks in a particular suit in a hand of bridge.

A relief pitcher, especially one called upon to protect a lead.

A player who excels on defense, as in basketball.

In soccer, a defensive player who plays behind the center midfielder and often guards the opponent’s best forward.

A goalie.

To close with or as if with a stopper.

To close or secure with a stopple: as, stoppered bottles.