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Noun: mellowing  me-low-ing
  1. The process of becoming mellow
Verb: mellow  me-low
  1. Soften, make mellow
    "Age and experience mellowed him over the years"
  2. Become more relaxed, easygoing, or genial
    "With age, he mellowed";
    - melt, mellow out
  3. Make or grow (more) mellow
    "These apples need to mellow a bit more"; "The sun mellowed the fruit"

Type of: ageing, aging, change, ripening, soften

Encyclopedia: Mellow