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complain verb

  /kəmˈpleɪn/
  • (intransitive) To express feelings of pain, dissatisfaction, or resentment.
quejarse, lamentarse, alegar, querellarse
  • (intransitive) To make a formal accusation or bring a formal charge.
quejarse, protestar, querellarse, reclamar

complainant noun

  /kəmˈpleɪnənt/
  • (legal) The party that brings a civil lawsuit against another; the plaintiff.
demandante, querellante
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