blow the cobwebs away
US /bloʊ ðə ˈkɑbˌwɛbz əˈweɪ/
UK /bloʊ ðə ˈkɑbˌwɛbz əˈweɪ/

1.
気分転換をする, 頭をすっきりさせる
to do something that makes you feel more active and awake, especially after a period of inactivity or rest
:
•
Let's go for a walk to blow the cobwebs away.
気分転換に散歩に行こう。
•
A good run in the morning always helps me to blow the cobwebs away.
朝のジョギングはいつも気分転換になる。