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Yours, Etc.: Origins and Uses of 8 Sign-Offs

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.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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