prick up one's earsLISTEN CAREFULLY, pay attention, become attentive, begin to take notice, attend, be all ears, hark
[TahlilGaran] Dictionary of Contemporary English ▲
prick up one's ears v. phr.,
informal To come to interested attention; begin to listen closely; try to hear.
The woman pricked up her ears when she heard them talking about her. [TahlilGaran] English Idioms Dictionary ▲