The rate at which employees leave and are replaced; or the total sales revenue of a business; or a pastry folded over filling.
From 'turn' plus 'over', originally describing the physical act of flipping something. Extended metaphorically to business contexts in the 19th century to describe cyclical replacement or total business activity.
This versatile word shows how English loves metaphorical extension - the simple physical act of turning something over gave us ways to discuss employee retention, business performance, and even describe a delicious pastry.
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