lose (one's) tongue

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lose (one's) tongue

To suddenly become unable to speak, typically due to shock or confusion. Kathy was so surprised when she won the award that she lost her tongue and wasn't able to make an acceptance speech. If I had to speak in front of a crowd that big, I think I would lose my tongue.
See also: lose, tongue
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

lose (one's) tongue

To lose the capacity to speak, as from shock.
See also: lose, tongue
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in classic literature ?
I tell you frankly it made me lose my tongue. 'For God's sake, Mr.
read my poem, but, for no reason, I lose my tongue. I'm trembling
Judge Williams said his vocabulary is still rudimentary and he tells his Spanish-speaking judicial assistant, Ana Eligio, "When I start rolling my r's I lose my tongue and it takes me three hours to get it back."