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

Many of those parasites are transmitted via insects, so natural selection will tend to favor defense mechanisms that ward off the pests. —Cody Cottier, Discover Magazine, 19 July 2024

Its venom, delivered through grooved teeth, serves both as a defense mechanism and as a means to subdue prey. —Scott Travers, Forbes, 14 Sep. 2024

Wasps sting primarily as a defense mechanism and several factors can trigger this response. —Tiffany Acosta, The Arizona Republic, 16 Aug. 2024

This defense mechanism keeps almost all molecules circulating in the bloodstream out of the brain, protecting that most vital of organs from harm. —Michael Irving, New Atlas, 1 Aug. 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