Etymology

colourfast

C3O1L1O1U1R1F4A1S1T1
English fast ← Middle English fast ← Old English fæst
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The story

  1. Englishcolour
  2. Proto-Germanic*fastuz
  3. Proto-West Germanic*fast
  4. Old Englishfæst
  5. Middle Englishfast
  6. Englishfast
  7. English todaycolourfast

From colour + fast.

Etymology from Wiktionary, CC BY-SA 4.0.