in AM, use 美国英语用 discolor
V-ERG (使)变色;(使)褪色 If something
discolours or if it
is discoloured by something else, its original colour changes, so that it looks unattractive.
(使)变色;(使)褪色 -
A tooth which has been hit hard may discolour. [VERB]
受过重击的牙齿可能会变色。
-
Some oil had seeped out, discolouring the grass. [VERB noun]
有些油渗出来了,把草地染得变了颜色。
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