on one's guard

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English

Prepositional phrase

on one's guard

  1. In a watchful state; alert; vigilant.
    Synonym: on the alert
    Be on your guard against pickpockets in the railway station.
    • 1944 March and April, Chas. S. Lake, “Some C.M.Es. I Have Known: VIII—Sir H. N. Gresley”, in Railway Magazine, page 74:
      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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