"pyramiding" in the noun sense
1. pyramiding
a fraudulent business practice involving some form of pyramid scheme e.g., the chain of distribution is artificially expanded by an excessive number of distributors selling to other distributors at progressively higher wholesale prices until retail prices are unnecessarily inflated
"pyramiding" in the verb sense
1. pyramid
enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts
2. pyramid
use or deal in (as of stock or commercial transaction) in a pyramid deal
3. pyramid
arrange or build up as if on the base of a pyramid
4. pyramid
increase rapidly and progressively step by step on a broad base
Source: WordNet® (An amazing lexical database of English)
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