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in the act
In the process of doing something. For example,
The police caught the robber in the act
I was in the act of closing the window
Second half of 1600s
Performing sexual intercourse, as in
Her father caught them in the act
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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