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on guard Definition

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on guard
noun(guard)
one assigned to protect or oversee another: such as
on guard
noun(guard)
a person or a body of persons on sentinel duty
on guard
noun(guard)
troops attached to the person of the sovereign
on guard
idiom(guard)
alert and ready to respond to possible danger, threats, problems, etc.
on guard
idiom(guard)
watching for possible danger, threats, problems, etc.

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