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cationic detergent

n.
1.a class of synthetic detergents in which the surface-active part of the molecule is the cation

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    Idiom of the Day

    scratch (someone's) back
    to do something for someone in the hope that they will do something for you
    "You scratch my back and I`ll scratch yours," the customer said when we talked about the new sales contract.



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    We tied it ________ to stop the wind blowing it away.

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