Definition of "impeach"

impeach

/ɪmˈpiːt͡ʃ/

verb
third-person singular simple present impeaches, present participle impeaching, simple past and past participle impeached
1. To hinder, impede, or prevent.
  Quotations
  These ungracious practices of his sons did impeach his journey to the Holy Land.
  1612, John Davies, Discoverie of the True Causes why Ireland was never entirely subdued
  I was afraid the same defluxion of Salt Rheum which fell from my Temples into my Throat in Oxford, and distilling upon the Uvula, impeached my Utterance a little to this Day
  1655, James Howell, “To my Father”, in Epistolæ Ho-Elianæ. Familiar Letters Domestic and Forren. […], 3rd edition, volume (please specify the page), London: […] Humphrey Mos[e]ley, […]
2. To bring a legal proceeding against a public official.
3. To charge with impropriety; to discredit; to call into question.
4. (law) To demonstrate in court that a testimony under oath contradicts another testimony from the same person, usually one taken during deposition.