turn on (one's) heel
To suddenly leave or depart. After walking in on an obviously private conversation, I turned on my heel and stepped right back out of the room. Several high-profile sponsors have turned on their heels following the athlete's controversial statements.
turn on one's heel
Leave, as in When I inquired about his sister, he turned on his heel and walked away. This idiom alludes to making a sharp about-face similar to a military step but here usually implies a sudden departure. It was first recorded in 1751.