preokrenuti

1. to turn around; to reverse; to transform
   Ta vest mu je preokrenula život. — That news changed his life completely.
2. (of a match score) to turn around; to come from behind
   Naši su preokrenuli rezultat u drugom poluvremenu. — Our team turned the score around in the second half.
3. (of an object) to turn over; to flip
   Preokrenuo je palačinku na drugu stranu. — He flipped the pancake over to the other side.

The reflexive preokrenuti se means 'to turn over; to change drastically'.