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Significats de upon one's guard en anglès

Vigilant.

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        Ús de upon one's guard en anglès
        1
        But when one is specially invited to be candid, one is naturally set upon one's guard.
        Doctor Thorne
        2
        Still, one must be always upon one's guard!
        Up the Hill and Over
        3
        One grew accustomed to see an enemy in every stranger, and to be upon one's guard before a neighbor as before some lurking traitor.
        The Malady of the Century