caught with one's pants down, be

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caught with one's pants down, be

Be surprised in an embarrassing or guilty posture, as in We spent a lot of time preparing for the inspection; we didn't want to get caught with our pants down . This phrase presumably alludes to someone's pants being lowered to attend to bathroom needs but is not considered particularly vulgar. It is similar to off guard and, if wrongdoing is discovered, catch red-handed. [Colloquial; early 1900s]
See also: caught, pant