be caught off (one's) guard(redirected from are caught off their guard)
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be caught off (one's) guard
To be taken by surprise; to be caught when one is vulnerable, careless, or inattentive. We'll wait until he's caught off guard, and then we'll take him and his company for all they're worth! Don't be caught off your guard. There are a lot of suspicious characters around here.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.