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

The researchers’ study of dice snakes has prompted further questions from other scientists, such as whether life experience can explain why some individual snakes don’t engage in all three defense mechanisms. —Christian Thorsberg, Smithsonian Magazine, 9 May 2024

As a defense mechanism, ladybugs secrete a substance that can cause painful mouth and stomach ulcers, Watkins says. —Clare Mulroy, USA TODAY, 9 May 2024

Word History

First Known Use

1909, in the meaning defined at sense 1

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