mellow
US /ˈmel.oʊ/
UK /ˈmel.oʊ/

1.
êm dịu
smooth and soft, or not too sharp, bright, new, or rough:
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mellow flavors
1.
êm dịu
to become softer and more developed in a pleasing way:
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The brickwork will mellow over the years so that it blends with the surroundings.