Term: lighten up

lighten up (phrasal verb): to become less serious or worried; to stop being so annoyed or stressed about something. 

synonyms: relax, cheer up, take it easy, loosen up. 

pronunciation: /ˈlaɪtn ʌp/ 

translation: atslābt, kļūt dzīvespriecīgākam, uztvert lietas mierīgāk 

example: You need to lighten up! It was only a joke, and no one was actually offended. 

other words from this root: light (adjective), lightness (noun), lighting (noun).