#challenge  a call to engage in a contest or fight
  supertype:  #speech_act  the use of language to perform some act
  subtype:  #dare__daring  a challenge to do something dangerous or foolhardy; "he could never refuse a dare"
  subtype:  #confrontation  a bold challenge
  subtype:  #call-out  a challenge to a fight or duel
  subtype:  #defiance  a hostile challenge
  subtype:  #calling_into_question__demand_for_explanation  a challenge to defend what someone has said
  subtype:  #demand_for_identification  as by a sentry

No statement uses or specializes #challenge; click here to add one.