English edit

Etymology edit

counter- +‎ sue

Verb edit

countersue (third-person singular simple present countersues, present participle countersuing, simple past and past participle countersued)

  1. (transitive, intransitive) To sue a person or entity who is suing one.
    • 2014, Eric L. Haralson, Encyclopedia of American Poetry: The Nineteenth Century, page 497:
      Forrest later attacked Willis in New York, knocking him to the ground; lawsuits proliferated as Willis sued Forrest for assault, and Forrest countersued for libel.