a show-stopper

a performance or part of a performance that is extremely good Her conference speech was a real show-stopper.

Name	Pronounced	Usage
Prune	-	French
Bartosz	BAHR-tawsh	Polish
Ace	[eis]
Jeanette	[dʒə'net]
Kandace	KAN-dis, kan-DAY-see, KAN-də-see	English (Modern)
Sargent	['sa:dʒənt]