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tracer

n.
1.an investigator who is employed to find missing persons or missing goods
2.an instrument used to make tracings
3.(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
4.ammunition whose flight can be observed by a trail of smoke

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    Idiom of the Day

    hop to it
    to get started, to start a job
    We must hop to it and try to finish this job before dinner.



    1.
    ________ car is over there.

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