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half life

n.
1.the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

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    Idiom of the Day

    burn the candle at both ends
    to work or play too hard without enough rest
    The man has been burning the candle at both ends with his work and he is now sick.



    1.
    He's as cold as ________; he shows no emotion.

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