Tenbagger

A stock whose value increases ten times over its purchase price. This expression was coined by Peter Lynch, one of the greatest investors of all time, in his book "One Up On Wall Street" (1989).

Investopedia Says:
These types of returns are considered once-in-a-lifetime investments. Some of the most famous examples of tenbaggers include now blue-chip stocks like Wal-Mart, Hewlett-Packard and General Electric. Many investors are constantly in search of the elusive tenbagger, but there isn't an exact science to discover tenbagger stocks. Generally, these explosive companies are smaller companies (market cap under $1 billion) with large potential markets. Over time, these companies grow into their potential markets, providing patient investors with handsome returns.

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Stock that grows in value by ten times. The term comes from baseball lingo, since a double is called a two-bagger because it earns the hitter the right to two bases, or bags. Similarly, a triple is a three-bagger and a home run a four-bagger. The term, as applied to investing, is also used in larger multiples, such as a twenty-bagger, for a stock that grows twenty-fold.