defense mechanism
US /dɪˈfens ˌmek.ə.nɪ.zəm/
UK /dɪˈfens ˌmek.ə.nɪ.zəm/
1.
an unconscious means of protecting oneself from anxiety, guilt, or other unacceptable feelings or thoughts
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Humor can be a powerful defense mechanism against stress.
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He developed a cynical attitude as a defense mechanism.
2.
a physical or behavioral feature of an animal that helps it to protect itself from predators
:
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The chameleon's camouflage is a remarkable defense mechanism.
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The skunk's spray is an effective defense mechanism against threats.