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lay it on thick

lay it on thick idiom

Also, lay it on with a trowel. Exaggerate, overstate; also, flatter effusively. For example, Jane laid it on thick when she said this was the greatest book she'd ever read, or Tom thought he'd get the senator to waive the speaker's fee if he just laid it on with a trowel. This idiom alludes to applying a thick coat of paint or plaster. [c. 1600]

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.