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Lubricate Make Machinery Smooth Easy Work Putting Oil

Front lubricate
Back make (machinery) smooth and easy to work by putting on oil, grease, or a similar substance
a. The bulky* wheels of a railroad train must be lubricated each week.
b. A large quantity* of grease is needed to lubricate an airplane engine.
c. When a watch is lubricated, it keeps more accurate* time.

Tags: 18, lesson

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