pyramid

(noun) a polyhedron having a polygonal base and triangular sides with a common vertex.

(noun) (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.

(noun) a massive monument with a square base and four triangular sides; begun by Cheops around 2700 BC as royal tombs in ancient Egypt. Synonyms: Pyramid, Great Pyramid, Pyramids of Egypt.

(verb) enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts.

(verb) use or deal in (as of stock or commercial transaction) in a pyramid deal.

(verb) arrange or build up as if on the base of a pyramid.

(verb) increase rapidly and progressively step by step on a broad base.