prick up one's ears
ears prick
ears prick up

My father pricked up his ears at this, and asked who her captain might be.

I pricked up my ears and ran to where the noise was coming from.

The horse pricked up her ears and turned toward the sound.

The mention of gold was enough to prick up any man's ears, but especially his.

But he sure as hell did prick up his ears.

He pricked up his ears and really looked at the wall passing by him.

Once in a long time you prick up your ears and listen.

Another note, and I prick up my ears to hear what's going on.

Both the king and the prince pricked up their ears.

At first Jack did not listen - and then he heard something that made him prick up his ears.