A term used in technical analysis. A breakaway gap represents a gap in the movement of a stock price supported by levels of high volume.
The image shows a gap at the beginning of a large upward movement.
If you chart it, the gap reflects a bullish movement when the price has gapped upwards and a bearish movement when the price has gapped downwards.
Introduction to Technical Analysis - Here is an easy-to-understand tutorial on the various tools used in technical analysis, including moving averages, RSI, Bollinger bands, stock chart patterns, and much more.