Idioms and Phrases with hear oneself think, can't
hear oneself think, can't
Be unable to concentrate because there is too much noise. For example, There was so much noise from the jackhammers we couldn't hear ourselves think. [Early 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.