showstopper I. \ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷\noun : an act, song, or performer that wins applause so prolonged as to interrupt a performance II. noun : something or someone exceptionally arresting or attractive < the gold crown was the showstopper of the exhibition > • showstopping\ˈ ̷ ̷ ˌ ̷ ̷ ̷ ̷ \adjective