Verb decolour has 1 sense
  1. bleach, bleach out, decolor, decolour, decolorize, decolourize, decolorise, decolourise, discolorize, discolourise, discolorise - remove color from; "The sun bleached the red shirt"
    --1 is one way to discolor
    Sample sentences:
    Somebody ----s something
    Something ----s something
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