Definition of 'showstopper'

Noun

1. an act so striking or impressive that the show must be delayed until the audience quiets down
      Synonyms: show-stopper stopper
2. 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"
      Synonyms: show-stopper

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