defense mechanism

noun

1
: an often unconscious mental process (such as repression) that makes possible compromise solutions to personal problems
2
: a defensive reaction by an organism

Examples of defense mechanism in a Sentence

She is projecting her anger on you as a defense mechanism. the cell's normal defense mechanisms against infection
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The council’s proposals involve the Gulf countries deepening their own economic integration, establishing joint defense mechanisms, and then somehow resolving the Israeli-Palestinian conflict through a now practically impossible two-state solution. Maha Yahya, Foreign Affairs, 17 Feb. 2025 From creative hunting tactics to cheeky defense mechanisms, these snake species substantiate the famed qualities chronicled in the Jade Emperor’s long-ago competition. Ryley Graham, Smithsonian Magazine, 29 Jan. 2025 It’s called intellectualizing as a defense mechanism. Kristen Rogers, CNN, 2 Feb. 2025 Exhibiting behavior similar to symptoms of rabies is part of the animal's defense mechanism against predators. Gordon G. Chang, Newsweek, 24 Jan. 2025 See All Example Sentences for defense mechanism

Word History

First Known Use

1909, in the meaning defined at sense 1

Time Traveler
The first known use of defense mechanism was in 1909

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Cite this Entry

“Defense mechanism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/defense%20mechanism. Accessed 28 Feb. 2025.

Medical Definition

defense mechanism

noun
1
: an often unconscious mental process (as repression, projection, or sublimation) that makes possible compromise solutions to personal problems
2
: a defensive reaction by an organism

More from Merriam-Webster on defense mechanism

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