If, for example, at the current update a stock's MT Tech Trend is down [] but during the previous update period it was up [], it is considered to be "Moving down".

Example:
During the June 1st update period a stock's MT Tech Trend was positive. By the time of the June 4th update the stock's price dropped below its technical reverse point. This would trigger the MT Tech Trend to turn negative and the stock would be considered to have a MT Tech Trend "Moving down".