Definition of "dirty tricks" []

• Informal Covert intelligence operations designed to disrupt the economy or upset the political situation in another country. (noun-plural)
• Informal Unethical behavior, especially acts undertaken to destroy the credibility or reputation of an opponent. (noun-plural)
• Informal Commercial espionage. (noun-plural)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Dasinger said, “I’ll keep the hypnotic and Quist’s bag of dirty tricks until we land."
• "The Acquisitions and Takeovers people are in a flap and TranStar’s chairman is screaming dirty tricks to the Market Surveillance Panel."