lighten up

US /ˈlaɪ.tən ʌp/

UK /ˈlaɪ.tən ʌp/

1.

to become less serious or more cheerful

:

•

Oh, lighten up! It was just a joke.

•

You need to lighten up and enjoy life more.

:

relax cheer up loosen up calm down chill out

:

lighten on the up and up up up to come up with follow up keep up with