tell on

tell on idiom
Tattle on, inform on, as in Marjorie said she'd tell on him if he pulled her hair again. This seemingly modern term appeared in a 1539 translation of the Bible (I Samuel 27:11): “David saved neither man nor woman ... for fear (said he) lest they should tell on us.”

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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