The term 'knocked 'em dead' is an idiom that means to have performed exceptionally well. This phrase can be used to describe a variety of situations, such as a comedian's stand-up routine, a musician's performance, or a speaker's presentation. The crossword solutions for this term are 'slayed' (6 letters) and 'WOWED' (5 letters). Both words mean to have impressed someone greatly, and are often used in the same context as 'knocked 'em dead'.