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On one's guard
"On one's guard" in a Sentence (2 examples)
Be on your guard against pickpockets in the railway station.
One had to be on one's guard when thus confronted and, in the course of my numerous meetings with him, I had on occasion to exercise all my wits and be prepared at a moment's notice to parry a very awkward question, to which I would much rather have given a considered reply.
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Unscramble this word: ononesguard