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1. A device, such as a cork or plug, that is inserted to close an opening.
2. One that causes something to stop: a conversation stopper.
3. Games 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.
4. Baseball A relief pitcher, especially one called upon to protect a lead.
a. A player who excels on defense, as in basketball.
b. In soccer, a defensive player who plays behind the center midfielder and often guards the opponent's best forward. Also called center back.
c. A goalie.
tr.v. stop·pered, stop·per·ing, stop·pers
To close with or as if with a stopper.