put (one) on guard

(redirected from put someone on their guard)

put (one) on guard

To cause one to assume a position, attitude, or mindset of wary caution. A possessive pronoun can be used between "on" and "guard." A slower-than-expected financial quarter has put some investors on guard. The unnerving silence of the small town put me on my guard.
See also: guard, on, put

put one on one's guard

to make one wary or cautious. The menacing growl by the watchdog put me on my guard. Every time the boss comes around, it puts me on my guard.
See also: guard, on, one, put
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