jazz hands - definition and synonyms

noun [plural] 

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/ˈdʒæz ˌhændz/
  1. in dance, musicals, cabaret etc, the action of waving the hands with the palms facing forward and the fingers wide open, in order to show excitement or enthusiasm

    Probably the biggest proponent of jazz hands was the late Bob Fosse, who incorporated them in nearly all of his Broadway and film musical choreography.