lighten up Informal
Meaning: to become less serious or more easy-goingSynonym: loosen up (informal)
- My boss is so serious all the time. I wish she'd lighten up and joke around with us sometimes.
- Salima said that if Kareem doesn't lighten up and learn to have some fun, she'll stop seeing him and look for someone else.
Jonas needs to lighten up a bit. He's