slip something over on

slip something over on idiom
Hoodwink, trick, as in Her lawyer tried to slip one over on him, but his lawyer wouldn't let him get away with it, or Don't trust Dan—he's always slipping something over on his customers. [c. 1900]

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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