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exertion [exertions]▼(the action of exerting)noun[UK: ɪɡ.ˈzɜːʃ.n̩] [US: ɪg.ˈzɝː.ʃn̩]
strain [strains]▼(violent effort, excessive and hurtful exertion or tension, as of the muscles.)noun[UK: streɪn] [US: ˈstreɪn]
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