| 单词 | grind down | 
| 释义 | grind downphrasal verb  ground down; grinding down; grinds down   1   : to make (something hard) smaller and smoother by gradually rubbing off tiny bits  The old dog's teeth had been ground down by use. 2   : to weaken or destroy (someone or something) gradually  Poverty ground her spirit down. These people have been ground down by years of oppression. | 
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