prick up ears

prick up (one's) ears

1. Literally, of an animal, to raise its ears, as upon hearing a sudden noise. The dogs pricked up their ears and started staring outside. I wonder what they heard.
2. To pay sudden close attention to something one overhears. Be sure to prick up your ears if anything about the case is mentioned. I can't help but prick up my ears if I hear someone say my name—even if they aren't talking about me.
See also: ear, prick, up
Farlex Dictionary of Idioms.

prick up (one's) ears

To listen with attentive interest.
See also: ear, prick, up
American Heritage® Dictionary of the English Language, Fifth Edition.

prick up one's ears, to

To listen attentively. This term, which alludes to horses holding up their ears at a sudden noise, dates from the sixteenth century. Shakespeare used it in The Tempest (4.1): “Like unback’d colts, they prick’d their ears.”
See also: prick, up
The Dictionary of Clichés by Christine Ammer
See also:
  • prick up (one's) ears
  • prick up its ears
  • prick up one's ears
  • prick up one's ears, to
  • prick up your ears
  • prick up
  • get (one's) ears lowered
  • pop (one's) ears
  • lower
  • prick (one's) ears up