noun
a gradual process of deterioration or weakening
verb
to gradually reduce or diminish in strength or effectiveness
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Over time, the constant friction can wear down the surface of the metal.
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If you keep using that old pair of shoes, they're going to wear down pretty quickly.
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I need to get some new tires for my car, these ones are starting to wear down.
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The stress of work and family responsibilities can wear down even the strongest individuals.