turning inward. introversion.
turning over or backward. inversion, reversal.
turning point. [crisis]; pivot. Associated words: pivotal, [critical].
turning upside down. inversion, reversal.
turning wrong side out. extroversion, eversion.
turnip-shaped, a. napiform.
turnkey, n. [warder].
turn upside down. invert, [reverse].
turtle, n. tortoise; terrapin.
tussle, n. [struggle], [contest], [scuffle], [conflict].