Slang. a state, atmosphere, or mood of ease and gentle relaxation.
Verb phrase
11.
mellow out, Slang.
a.
to become detached from worry, strife, stress, etc.; relax: After final exams let's go down to the beach and mellow out.
b.
to make more relaxed, agreeable, workable, etc.; soften or smooth: Chopin really mellows me out when I'm feeling tense.
Origin: 1400–50; late Middle English mel(o)we, alteration (perhaps by dissimilation, in phrase meruw fruit) of Middle English meruw,Old English meru soft
mid-15c., melwe "soft, sweet, juicy" (of ripe fruit), perhaps related to melowe, variant of mele "ground grain" (see meal (2)), influenced by M.E. merow "soft, tender," from O.E. mearu. Meaning "slightly drunk" is from 1680s. The verb is from 1570s. Related: Mellowed; mellowing.
mod. relaxed; untroubled; laid back. : She is the mellowest fox I know.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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