To remove scale from the surface of a metal, especially from the inner surfaces of boilers etc.(verb)
To remove the scales from a fish etc.(verb)
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Use "descale" in a sentence
"Nineth, there is no "descale" setting on this machine."
"The Little Plumber helps descale your existing system, leaving your water softer and kinder on the skin and hair."
"The processes I was quoting, that the U. S quarter like having affiliates meeting at all these is just the result of disintegration and the way in which we are learning how to descale."