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potassium permanganate

n.
1.a poisonous salt that forms dark purple crystals and is purple-red when dissolved in water

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    Idiom of the Day

    set (someone or something) free
    to release someone or something
    The conservation officers went to the mountains and set the bear free.



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    Choose an idiom to replace the expression in the brackets:
    We (had a lot of fun) at the sports festival last weekend.

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