Definition of “mellow” - English Dictionary

“mellow” in British English

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mellowadjective

uk /ˈmel.əʊ/ us /ˈmel.oʊ/

mellowverb

uk /ˈmel.əʊ/ us /ˈmel.oʊ/

(Definition of “mellow” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“mellow” in American English

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mellowadjective

us /ˈmel·oʊ/

mellow adjective (SMOOTH)

pleasing because of being smooth, soft, or well developed and not too sharp, bright, new, or rough:

a mellow flavor/tone

mellow adjective (RELAXED)

(of a person or mood) relaxed and pleasant:

He looks mellow on stage, but he’s always tense before the show.

mellowverb [ I/T ]

us /ˈmel·oʊ/

mellow verb [ I/T ] (SOFTEN)

to become more pleasing because of becoming more smooth, soft, or well developed and less sharp, bright, new, or rough:

[ I ] The bright orange of the fresh paint mellowed as it dried.
[ T ] Those medicinal herbs can be mixed with more appetizing herbs (= herbs that taste better) to mellow their flavors.

mellow verb [ I/T ] (RELAX)

(of a person or mood) to become more relaxed and pleasant:

[ I ] She used to be very impatient, but she’s mellowed.

Phrasal verb(s)

(Definition of “mellow” from the Cambridge Academic Content Dictionary © Cambridge University Press)