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hear a pin drop, can

Be able to hear even the smallest noise because of the quiet, as in When he came onstage you could have heard a pin drop. This hyperbolic expression dates from the early 1800s.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.