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    sentinel
    /ˈsɛntɪnl/

    noun

    • 1. a soldier or guard whose job is to stand and keep watch: "soldiers stood sentinel with their muskets"
    • 2. an indicator of the presence of disease: "a sentinel surveillance programme for influenza"

    verb

    • 1. station a soldier or guard by (a place) to keep watch: "a wide course had been roped off and sentinelled with police"

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