Definition of grind down phrasal verb from the Oxford Advanced American Dictionary

 

grind down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

grind somebodydown

 
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to treat someone in a cruel, unpleasant way over a long period of time, so that they become very unhappy Don't let them grind you down. Years of oppression had ground the people down.
See the Oxford Advanced Learner's Dictionary entry: grind down