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
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