crack the whip

crack the whip idiom
Behave in a domineering and demanding way toward one's subordinates. For example, He's been cracking the whip ever since he got his promotion. This expression, first recorded in 1647, alludes to drivers of horse-drawn wagons who snapped their whips hard, producing a loud cracking noise. Its figurative use dates from the late 1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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