Definition of wear down phrasal verb from the Oxford Advanced Learner's Dictionary

 

wear down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

wear down

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wear somethingdown

 
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to become, or make something become, gradually smaller or smoother by continuously using or rubbing it Notice how the tread on this tyre has worn down.

wear down somebody

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wear down something

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wear somebody down

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wear something down

 
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to make somebody/something weaker or less determined, especially by continuously attacking or putting pressure on them or it over a period of time Her persistence paid off and she eventually wore me down. This relentless pressure began to wear down their resistance.
See the Oxford Advanced American Dictionary entry: wear down