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strengthen [strengthened, strengthening, strengthens]▼(to grow strong or stronger)verb[UK: ˈstreŋ.θn̩] [US: ˈstreŋ.θn̩]
weaken [weakened, weakening, weakens]▼(to become weaker)verb[UK: ˈwiːkən] [US: ˈwiːkən]
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