throwback

noun

1. an act of throwing back.
2. a setback or check.
3. the reversion to an ancestral or earlier type or character; atavism.
4. an example of this.

noun

1. 1. a person, animal, or plant that has the characteristics of an earlier or more primitive type
   2. a reversion to such an organism

verb throw back (adverb)

2. (intr) to revert to an earlier or more primitive type
3. (tr foll by on) to force to depend (on)the crisis threw her back on her faith in God

n.“reversion to an ancestral type or character,” 1888, from throw (v.) + back (adv.); earlier it meant “a reverse in a course or progress, a relapse” (1856).