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2. In technical analysis, a situation in which the price of a security falls below a support level. The support level is a price below which a security only rarely drops. This is a highly bearish signal because it indicates the price likely will continue to fall until it finds another support level.
Stock prices fluctuate constantly, but each stock typically moves within a fairly narrow range. That means the stock's average price changes gradually, if at all. But sometimes a stock's price breaks out of its limits, and jumps or tumbles suddenly.
Usually the breakout is fueled by a particular event. The company may realize a commercial success, such as a drug company discovering a new cure for a major disease. Or a breakout may reflect a financial development, such as a new alliance with a successful partner.