The term 'Muff A Grounder' is a baseball term used to describe a defensive play in which a fielder catches a ground ball and then quickly throws it to another fielder to get an out. The crossword solutions for this term are ERR (3 letters), BOBBLE (6 letters), and BOOTIT (6 letters). ERR stands for error, which is when a fielder makes a mistake that allows a runner to advance or score. BOBBLE means to drop or mishandle the ball, while BOOTIT is a slang term for when a fielder kicks the ball instead of throwing it.