The fight or flight response is an automatic physiological reaction to an event that is perceived as stressful or frightening. In everyday terms, it's called the fight or flight response. Fight or Flight. The fight or flight response makes your body experience two types of reactions. With most things in life, there are positive and negative attributes associated with an issue – and stress is no different. In one case, energy leaves your body with physical symptoms like a pounding heart, sweating or a dry mouth. How to use fight-or-flight in a sentence. We developed the flight response as a way of escaping an overwhelming threat. If you’re unable to fight, you need to get to safety, and fast. The perception of threat activates the sympathetic nervous system and triggers an acute stress response that prepares the body to fight or flee. Biologically, stress is the body’s reaction to specific challenges or pressure presented by a threat or task at hand. Fight-or-flight response, response to an acute threat to survival that is marked by physical changes, including nervous and endocrine changes, that prepare a human or an animal to react or to retreat. fight-or-flight example sentences. However, it also leaves you emotionally and mentally wrecked from fear and anxiety. It serves you well if there's a real threat to your survival- say from a lion charging at you. Example sentences with the word fight-or-flight. Flight. Your blood pressure rises and your blood sugar increases. The adrenaline you feel pushes you to flee the situation. You might have heard of the fight or flight response.That's something that has gotten into our vocabulary a little bit. The physiology of fight or flight mobilizes you to attack back quickly, or run like hell.