modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"
embrown make brown in color; "the draught browned the leaves on the trees in the yard"
change undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"
darken -
tarnish or stain; "a scandal that darkened the family's good name"
tarnish,
maculate,
defile,
sully,
stain make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
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= antonym
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Wiktionary
Verb
darken -
To make dark or darker by reducing light.
darken -
To become dark or darker having less light.