lighten up

US /ˈlaɪ.tən ʌp/
UK /ˈlaɪ.tən ʌp/
"lighten up" picture
1.

진정하다, 마음을 가볍게 하다

to become less serious or more cheerful

:
Oh, lighten up! It was just a joke.
야, 좀 진정해! 그냥 농담이었어.
You need to lighten up and enjoy life more.
좀 진정하고 인생을 더 즐겨야 해.