show-stopper

or show·stop·per

[shoh-stop-er]
noun
  1. Theater. a performer or performance that wins enthusiastic or prolonged applause.
  2. a spectacularly arresting or appealing person or thing: This bright plaid suit is a real show-stopper.

Origin of show-stopper

First recorded in 1945–50
Related formsshow-stop·ping, show·stop·ping, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018