The term 'CATCHER's CATCHER' refers to a CATCHER's MITT, which is a glove used by catchers in the game of baseball. The MITT is designed to help the CATCHER catch and control the ball thrown by the pitcher. It is made of leather and has extra padding to protect the CATCHER's hand from the impact of the ball. The MITT also has a webbing between the thumb and forefinger to help the CATCHER grip the ball. The term 'CATCHER's CATCHER' is derived from the fact that the MITT is specifically designed to help the CATCHER catch the ball.