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biological clock

n.
1.an innate mechanism in living organisms that controls the periodicity of many physiological functions

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    Idiom of the Day

    speak for (something)
    to make a request for something, to ask for something
    I spoke for the comfortable chair as soon as I entered the room.



    1.
    He thought he could make it but after considering the complicated situation, he ________ all hope.

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