heel turn

Short definition from Wiktionary

Noun

1. 1
   A ballroom dancing move in which the dancer steps backwards, shifts their weight on to the back foot, and turns on the heel of that foot while holding the other foot close and parallel to it.
2. 2
   A turn executed by shifting weight on to the heel(s).
3. 3
   An act of turning around abruptly, especially so that one faces the opposite direction.
4. 4
   An act of turning around abruptly, especially so that one faces the opposite direction: A radical change (of mind, opinion, etc.).
5. 5
   A situation in which a wrestler previously identified as a hero changes to being considered a villain
6. 6
   A situation in which a wrestler previously identified as a hero changes to being considered a villain: A situation in which someone changes from being a hero into a villain.