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

Millie’s relentless world-building is not just a defense mechanism, but a valiant attempt to live otherwise. —Beatrice Loayza, The Atlantic, 15 July 2024

This network of organs and lymph vessels plays a key role in the immune system, the body's defense mechanism against disease and other foreign invaders. —Cristina Mutchler, Health, 5 July 2024

So plants have evolved many different defense mechanisms to inhibit this threat, including physical and chemical weapons. —Jacob S. Suissa, The Conversation, 20 June 2024

Health How horseshoe crab blood became one of the most valuable liquids in medicine The crabs’ blue blood contains an ancient immune defense mechanism that has helped save countless human lives. —Big Think, 24 June 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