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sentinel [sentinels]▼(A sentry or guard)noun[UK: ˈsen.tɪn.l̩] [US: ˈsen.tən.l̩]
sentry [sentries]▼(guard)noun[UK: ˈsen.tri] [US: ˈsen.tri]He's on sentry duty. = Está de centinela.
watchman [watchmen]▼(guard)noun[UK: ˈwɒt.ʃmən] [US: ˈwɑːt.ʃmən]
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