Wiktionary
fight-or-flight
alt. All the coordinated physiological responses that the sympathetic nervous system initiates in response to stress or other emergency situations. n. All the coordinated physiological responses that the sympathetic nervous system initiates in response to stress or other emergency situations.
Usage examples of "fight-or-flight".
With the whoosh-crack of the jumpers filling the air with sound, they took off, heading low and fast around the neighborhoods involved in the gunfighting, which was now dying down as people came out of that first screaming fit of fight-or-flight shooting.