1. a person or thing that throws or tosses something
Usage: informal; commonly used in sports and casual contexts
2. a device or machine that holds and rotates a workpiece in a lathe or drill press
Usage: technical; woodworking and metalworking

Examples

• He's a great chucker on the baseball team.
• The pitcher is known as a reliable chucker of fastballs.
• The drill's chucker gripped the bit firmly.
• She's a chucker of old clothes whenever she redecorates.
• The lathe chucker held the metal rod in place during machining.