bluing

verb

  1. 1

    To make or become blue.

  2. 2

    To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.

  3. 3

    (laundry) To brighten by treating with blue (laundry aid)

  4. 4

    To spend (money) extravagantly; to blow.

noun

  1. 1

    A substance used in laundry to whiten clothes; blue

  2. 2

    Any of several processes to protect steel against rust

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