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strengthen [strengthened, strengthening, strengthens]▼(to grow strong or stronger)verb[UK: ˈstreŋ.θn̩] [US: ˈstreŋ.θn̩]
strengthen [strengthened, strengthening, strengthens]▼(to make strong or stronger)verb[UK: ˈstreŋ.θn̩] [US: ˈstreŋ.θn̩]
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