throw back (Adjective) — Characteristic of an atavist. ex. "The throwback dew claw in many dog breeds is a simple example of a genetic trait"
throw back (Noun) — An organism that has the characteristics of a more primitive type of that organism.
throw back (Noun) — A reappearance of an earlier characteristic.
throw back (Verb) — Throw back with a quick, light motion. ex. "She threw back her head"