knuckler

Example:John is quite a knuckler in the company, always causing trouble with his aggressive behavior.

Definition:A person who is known for being aggressive, rebellious, or prone to causing trouble.

Example:The maintenance worker ensured that the knuckled-rail prongs were tight to prevent wire movement after the storm.

Definition:A prong used in fixing rails in place, typically in telephone or utility installations.

Example:The pitcher used a knuckled ball to deceive the batter, making it hard to track the ball's path.

Definition:A type of pitch in baseball thrown by gripping the baseball with the fingers, causing the ball to erratic movement and make it hard to catch or hit.