0 to (cause something to) change from the original colour and therefore to look unpleasant -- （使）褪色，（使）變色
The developed approach has the advantages of both adaptive and robust control laws, without their discolour tags.
The sealed glass tubes are filled with a solid carrier material containing reagents that discolour on contact with specific contaminants.
The moss was burnt off the willow stocks and in some cases the heat discoloured and even damaged the bark of the stocks.
The lint hairs produced from this seed are discoloured, but there are no signs of the fungus beyond the actual point of inoculation.
Either it had darkened as he grew older in life, or it was discoloured by some chemical process that occurred in the grave.
On no account must an excess of creosote be used or it will discolour the insects.
Embryos that remained white and firm were scored as viable while those that were soft, discoloured or contaminated with fungal growth were scored as nonviable.
Every spot of spray makes a lasting blot on the sails and discolours them for ever.
