show-stopper
1. [ noun ] something that is strikingly attractive or has great popular appeal
Synonyms: showstopper
Examples:

"she has a show-stopper of a smile" "the brilliant orange flowers against the green foliage were a showstopper"

Related terms: attraction
2. [ noun ] (theater,performing arts) an act so striking or impressive that the show must be delayed until the audience quiets down
Synonyms: stopper showstopper
Related terms: act
Similar spelling:   showstopper