you could hear the grass grow(ing)

you could hear the grass grow(ing)

It is so still or quiet that one would be able to hear even the tiniest, imperceptible sounds. I reckon you could hear the grass growing in the awkward silence that followed that dreadful performance.
See also: could, grass, hear
Farlex Dictionary of Idioms.
See also:
  • hear from
  • hear from (one)
  • you could have heard a pin drop
  • you could hear a pin drop
  • could hear a pin drop
  • hear a pin drop, can
  • hear (one) loud and clear
  • fancy that
  • Fancy that!
  • hear through