off (one's) guard(redirected from off your guard)
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Related to off your guard: catch off guard
off (one's) guard
Not being especially careful or vigilant; not prepared for danger or surprises; being careless or inattentive. He's got a lot of tricky moves, so don't be caught off your guard! We'll wait until he's off his guard, and then we'll take him and his company for all they're worth!