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WordNet
mellow out

v. become more relaxed, easygoing, or genial; "With age, he mellowed" [syn: mellow, melt]

Wikipedia
Mellow Out

Mellow Out is the debut studio album of Mainliner, released in 1996 through Charnel Music.

Usage examples of "mellow out".

And Steve - he's the guy who usually goes around saying mellow out, like mellow out this and mellow out that and why don't you fuckin mellow out, you know?

A decapitation and some spilled blood were apparently just the sort of things that Buzz and Liz, if not Richie, needed to see in order to burn off the chemicals bubbling in their bloodstreams, the sort of thing they needed to experience in order to mellow out again.

I broke away, started walking around, looked for a quiet room to mellow out in, but there was none.