defense mechanism

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.

defense mechanism

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.

Word History and Origins

Origin of defense mechanism¹

First recorded in 1890–95

Example Sentences

“Growing up undocumented you grow skeptical, with a nonstop defense mechanism. Even though I’ve seen co-workers get permits, I haven’t accepted it,” A. said.

From Los Angeles Times

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

But it's not long into the second season where all of Alice's defense mechanisms come crumbling down.

From Salon

My greatest fears began to unfold as I crept back into the only defense mechanism I’ve ever known.

From Los Angeles Times

By understanding how ferns and flowering plants independently developed similar defense mechanisms, scientists can better appreciate the underlying principles governing biodiversity and ecosystem function.

From Science Daily