expression, godan verb (-su)
cheer up; lift one's spirits; distract oneself
Used when someone does something to improve their mood or take their mind off worries. Often implies a deliberate action to dispel gloom or boredom.
友達とカラオケに行って気を晴らした。
I went to karaoke with friends to cheer myself up.
散歩でもして気を晴
Let's take a walk or something to lift our spirits.