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water-fast

[waw-ter-fast, -fahst, wot-er-]
adjective
  1. (of a color or dye) resistant to the effects caused by water; not changed or faded by the action of water.
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Origin of water-fast

First recorded in 1540–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018