catch (one) in the act of (doing something)

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catch (one) in the act of (doing something)

To discover or come upon, and perhaps apprehend, one as one does something (especially something nefarious or illegal). The police caught the robbers in the act of ransacking another house. We managed to catch the perpetrator in the act of stealing money the cash register.
See also: act, catch, of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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