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first law of thermodynamics

n.
1.the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes

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    Idiom of the Day

    hedge in (something) or hedge (something) in
    to keep something from getting out or moving freely, to block something in
    My car was hedged in by the other cars and I was unable to move it this morning.



    1.
    We met ________ a foggy day in March

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