A "tidy profit" is a term used to describe a significant and substantial return on an investment or business venture. It implies that the profit made was not only considerable, but also well-organized and efficient in its execution. The word "tidy" suggests orderliness, neatness, and precision - all of which are characteristics of a successful and profitable endeavor. In essence, a tidy profit is one where everything has gone according to plan, resulting in a lucrative outcome for the investor or business owner.