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make imperfect; "nothing marred her beauty"
corrupt morally or by intemperance or sensuality; "debauch the young people with wine and women"; "Socrates was accused of corrupting young men"; "Do school counselors subvert young children?"; "corrupt the morals"
Spoil or impair the quality or efficiency of.
take away the legal force of or render ineffective; "invalidate a contract"