dissipate

dis|si|pate /d'ɪsɪpeɪt/ (dissipates dissipating dissipated)
1 [VERB] V, V n
When something dissipates or when you dissipate it, it becomes less or becomes less strong until it disappears or goes away completely. (FORMAL)
The tension in the room had dissipated...
He wound down the windows to dissipate the heat.
2 [VERB] V n
When someone dissipates money, time, or effort, they waste it in a foolish way. (FORMAL)
He is dissipating his time and energy on too many different things...