showstopper

Carmine Gallo "Talk like TED" からの引用です。
Near the end of the concert, Pink, dressed in a gold bodysuit, jumped into a harness that propelled her high in the air like Tinker Bell and carried her across the entire length of the sold-out 17,000-person arena. Perches were stationed around the arena, where Pink would land for a few moments, closer to fans, then get pulled away to zip across the stadium while belting out one of her anthems. A reviewer for the Hollywood Reporter called it the showstopper. "It was beginning to seem like just another pop show with song-and-dance routines, but she pulled out all the stops with the encore of So What...
"showstopper" は字面からするとショーを駄目にする感じですが、文脈から全くその反対の意味の様です。辞書で確認します。
・Oxford English Dictionary: A song or other performance receiving prolonged applause from the audience.: he wants every scene to be a showstopper

・Collins Dictionary: If something is a showstopper, it is very impressive.: Her natural creativity and artistic talent make her home a real showstopper.

・Cambridge English Dictionary: a piece in a stage performance that the audience enjoy so much that their clapping and shouts of approval interrupt the performance: a showstopping performance
文字通り "showstopper" は厄介者の意味で使われることもある様です。
・Oxford English Dictionary:

a) An obstacle to further progress.: the subsidy limits proved to be a showstopper for other senior Democrats who refused to pass the bill with such restrictions
b) A bug that needs to be fixed before a piece of software can be used or released.: there were several last minute showstoppers that derailed the Beta 2 rollout