Fight-or-flight Definition

fītôrflīt
adjective
Designating or of an animal's overall instinctive response to danger, that prepares it either to confront or to flee the threat: among the common physical reactions are a release of epinephrine into the bloodstream and increased blood flow to the muscles.
Webster's New World
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noun

All the coordinated physiological responses that the sympathetic nervous system initiates in response to stress or other emergency situations.

Wiktionary

Alternative spelling of fight-or-flight.

Wiktionary
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fight-or-flight