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detractor one who criticizes or disparages an idea, cause, or person to undermine support or popularity.
dirty tricks (informal) unethical or illegal acts, esp. against a political opponent, designed to disrupt or undermine the opponent's activities, as during a campaign. [1/2 definitions]
mine2 to ruin or destroy by slow means; undermine. [1/9 definitions]
sabotage a secret operation or act, esp. one carried out by an insider, to damage property, obstruct operations, undermine negotiations, or the like. [1/2 definitions]
sap2 to gradually undermine or weaken. [1/4 definitions]
Schenck v. United States the U.S. Supreme Court case decided in 1919 that upheld the criminal conviction of the defendant for violation of the Espionage Act of 1917. In the majority opinion, Oliver Wendell Holmes, Jr. argued that speech aimed to undermine military or naval operations during wartime presented a "clear and present danger" to the security of the country.
scupper to undermine; ruin. [1/3 definitions]
subversive tending or intended to undermine or cause the overthrow of an established authority, esp. a national government. [2 definitions]
subvert to undermine the character, loyalties, or principles of (a person, institution, or the like); corrupt. [1/2 definitions]
undercut to act so as to lessen the effectiveness or influence of; undermine or thwart. [1/6 definitions]