hear a pin drop, one/you could

(one) could hear a pin drop

One could perceive the tiniest noise because the room is completely quiet and still. We all stayed so quiet following the boss's outburst that we could hear a pin drop. Sarah said she could hear a pin drop as the audience intently watched the actors on stage.
See also: could, drop, hear, pin
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

hear a pin drop, one/you could

Complete silence. This hyperbole dates from the early nineteenth century. An early appearance in print is in Susan Ferrier’s The Inheritance (1824): “You might have heard a pin drop in the house while that was going on.” Although pins are a far less common household item than they once were, the expression survives.
See also: could, hear, one, pin
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
See also: