The Collaborative International Dictionary of English v.0.48:
Throw back \Throw back\, v. i. to revert to an ancestral type or character. "A large proportion of the steerage passengers throw back to their Darwinian ancestry." --The Century. [Webster 1913 Suppl.] [1913 Webster]WordNet (r) 3.0 (2006):
throw back v 1: throw back with a quick, light motion; "She tossed back her head" [syn: throw back, toss back]