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impair [impaired, impairing, impairs]▼(have a diminishing effect on)verb[UK: ɪm.ˈpeə(r)] [US: ˌɪm.ˈper]
weaken [weakened, weakening, weakens]▼(to make weaker)verb[UK: ˈwiːkən] [US: ˈwiːkən]
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