When you think pyramid, you're probably picturing the famous pyramids of Egypt — the enormous triangular monuments where pharaohs were buried thousands of years ago.
Besides being a polyhedron shape, pyramid can also represent shady financial dealings. If you've got a pyramid scheme — and if you do, you may be reading this from your jail cell — you have people buy into your "investment" and then they recruit others to buy in, too. The early investors rise in the pyramid and are then paid "returns" out of the funds paid in by the new investors they've recruited (the pyramid base), and on and on.
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a polyhedron having a polygonal base and triangular sides with a common vertex
arrange or build up as if on the base of a pyramid
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(stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases
use or deal in (as of stock or commercial transaction) in a pyramid deal
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