1. something that serves as a climax or finishing touch
Usage: informal
2. a person or device that puts caps on bottles or containers
3. a person who acts as a decoy to lure others into gambling or making purchases
Usage: slang

Examples

• The fireworks display was the perfect capper to the celebration.
• His joke was the capper that had everyone laughing.
• The factory worker operated the bottle capper all day.
• They bought a new capper for their home brewing equipment.
• The casino used a capper to encourage other players to bet.
• That final goal was the capper on an amazing game.