What is "overhook"

In wrestling, an overhook, also called a whizzer, is a clinch hold that is used to control the opponent. An overhook is performed from any direction by putting an arm over the opponent's arm, and encircling the opponent's arm or upper body. Having an overhook with one arm is called a single overhook, while having overhooks with both arms is known as double overhooks. Overhooks are typically employed in response to underhooks by an opponent.