Meaning of “grey water” in the English Dictionary

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"grey water" in English

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(Definition of “grey water” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grey water" in Business English

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grey waternoun [ U ]

US gray water uk us ENVIRONMENT

water that has been used before, for example for washing, that can be stored and used again:

If more properties were fitted with a grey water system we would be saving up to 30% of our fresh water.

(Definition of “grey water” from the Cambridge Business English Dictionary © Cambridge University Press)