defense reflex

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de·fense re·flex

1. Synonym(s): flexor reflex
2. automatic reactions of an animal, for example, raising of hair or feathers, dilation of the pupils, or baring of claws, when alarmed.
(1) a reaction of the autonomic nervous system to perceived threat; alarm reaction

(2) withdrawal reaction

defense reflex

Retraction or tension in response to an action or threatened action.
See also: reflex
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