Definition of 'Basing'
A period in which a stock or other traded security is showing little in the way of upward or downward movement. The resulting price pattern is a flat line. Often, 'basing' is a term used by technical analysts to describe an issue that is consolidating after a period of rapid growth or decline. A basing stock is one with equal amounts of supply and demand.
Investopedia explains 'Basing'
Basing is a common occurrence after a stock or the market has been in a lengthy decline or has increased by a large amount. In other words, the market is taking a break. Some stocks can form a base that lasts for severals years before the trend is reversed.
A basing stock is also thought to be one that is forming new lines of support and resistance. In essence, basing is the merging of previous lines, which leads to the formation of different ones. Many technical analysts believe that basing is crucial, especially for surging stocks. They view basing as the "breather" that allows the issue to continue climbing.