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wear down▼(to cause physical or mental fatigue)
verb
[UK: weə(r) daʊn] [US: ˈwer ˈdaʊn]

wear out▼(to exhaust; to cause or contribute to another's exhaustion, fatigue, or weariness)
verb
[UK: weə(r) ˈaʊt] [US: ˈwer ˈaʊt]