definition of
showstopper

[1] #1 showstopper n. [show-stopper, stopper] an act so striking or impressive that the show must be delayed until the audience quiets down. wn

[2] #2 showstopper n. [show-stopper] something that is strikingly attractive or has great popular appeal; "she has a show-stopper of a smile"; "the brilliant orange flowers against the green foliage were a showstopper". wn