Upward release - Upward release

…It also refers to quickly selling stocks after they have risen in price. When the opening price is significantly higher than the closing price of the previous day, it is called an “upward breakout.” Conversely, when it starts significantly lower, it is called a “downward breakout.” This often occurs when the market is holding steady and then breaks out either up or down. …

*Some of the terminology explanations that refer to "kamihare" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…買った株を値上がり後さっさと売ってしまうこともいう。　上放れ寄付きの値段が前日の終値よりとび抜けて高くなったとき〈上放れ〉といい，反対に大幅に安く始まったとき〈下放れ〉という。これは相場が保（も）ち合って，それを上か下かへ放れるときに起こる場合が多い。…

※「上放れ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報