to perk (up) one's ears
01
to hear something interesting and start to listen to it carefully
![to [perk|prick] (up|) {one's} ears definition and meaning](https://cdn.langeek.co/photo/42696/original/?type=jpeg "to [perk|prick] (up|) {one's} ears definition and meaning")
Idiom
Informal
例子
He seemed to like me being there and always perked his ears up when I started reading to him.
He used obscene words that pricked my ears.
