1V-ERG (使)消失;消除;驱散 When something dissipates or when you dissipate it, it becomes less or becomes less strong until it disappears or goes away completely. (使)消失;消除;驱散 [formal]
The tension in the room had dissipated. [VERB]
房间里的紧张气氛消失了。
He wound down the windows to dissipate the heat. [VERB noun]