vitiate

Verb
  1. Corrupt morally or by intemperance or sensuality (synset 202585532)
    "debauch the young people with wine and women"; "Socrates was accused of corrupting young men"; "Do school counselors subvert young children?"; "corrupt the morals"
  2. Make imperfect (synset 200478872)
    "nothing marred her beauty"
  3. Take away the legal force of or render ineffective (synset 200449395)
    "invalidate a contract"

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