defense mechanism

American  

noun

1. Physiology. the defensive reaction of an organism, as against a pathogenic microorganism.

2. Psychology. an unconscious process, as denial, that protects an individual from unacceptable or painful ideas or impulses.

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defense mechanism Cultural  

1. In psychology, a Freudian term referring to an unconscious avoidance of something that produces anxiety or some other unpleasant emotion. For example, someone who blots out the memory of a terrible accident is using a defense mechanism. Regression and sublimation are common defense mechanisms.

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Etymology

Origin of defense mechanism

First recorded in 1890–95

Example Sentences

For Divon, Pallywood is less a conspiracy theory than a psychological defense mechanism.

From Slate • May 30, 2025

It is important to remember that inflammation is a defense mechanism of the body.

From Science Daily • Dec. 4, 2024

Scientists believe that algae use bioluminescence as a defense mechanism — to scare off hungry sea creatures or call attention to their location, which draws the predators’ predators.

From Los Angeles Times • Oct. 30, 2024

“I’m ready to take care of business, as a defense mechanism, because it’s gotten to the point where you have to take some responsibility for your own safety.”

From Los Angeles Times • May 9, 2024

But then my body took over and this primal defense mechanism, said, No, we will not stand for this.

From "Dumplin'" by Julie Murphy