tornar
turn
turn
to change direction or position
+
-ar
verb suffix
Tornar means to turn and can be thought of as related to the English word turn0 with the Spanish -ar1 verb suffix1.
verb
  1. turn
    To turn; to change or transform into something else
    El cielo comenzó a tornar gris antes de la tormenta. // The sky began to turn gray before the storm.