noun
a response to a perceived harmful event, attack, or threat, which prepares the body to either fight or flee
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When faced with a threatening situation, the body's natural response is to activate the fight or flight response.
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I had to decide whether to fight or flight when the dog started chasing me.
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I was totally in fight or flight mode when I saw my ex at the party.
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The intense pressure of the deadline triggered my fight or flight instincts.