prick up your ears
US /prɪk ʌp jʊər ɪərz/
UK /prɪk ʌp jʊər ɪərz/
1.
to listen carefully or suddenly become attentive
:
•
When I mentioned a pay raise, everyone at the meeting began to prick up their ears.
•
The dog would always prick up its ears at the sound of the doorbell.