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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.
an autonomic defensive response by an animal when threatened. The response may consist of dilated pupils, baring of claws, or raising of feathers or hair.
(2) withdrawal reaction
Retraction or tension in response to an action or threatened action.
See also: reflex