hold-up vs wild card

hold-up

noun
  • The holding back of a card that could win a trick in order to use it later. 

  • A robbery at gunpoint. 

  • Women's stockings designed to be worn without suspenders. 

  • A delay or wait. 

  • The inventory of nuclear material within a separation plant. 

wild card

noun
  • A card that can be assigned any value or used to substitute for any needed card. 

  • A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion. 

How often have the words hold-up and wild card occurred in a corpus of books? (source: Google Ngram Viewer )