| 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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