1. an illegal scheme for making money by manipulating stock prices; the schemer persuades other people to buy the stock and then sells it himself as soon as the price of the stock rises;
WordNet (r) 3.0 (2006):
pump-and-dump scheme
n 1: an illegal scheme for making money by manipulating stock
prices; the schemer persuades other people to buy the stock
and then sells it himself as soon as the price of the stock
rises