on the tip of one's tongue

on the tip of one's tongue idiom
Ready to utter something but unable to remember it at the moment, as in I met him last year and his name is on the tip of my tongue—it'll come to me in a minute. [Early 1700]

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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