prick up ears
聚精会神地倾听，注意力高度集中
口语·表达突然感兴趣
英文释义
to pay close attention or become suddenly interested in something that has been said or heard
例句
The kids pricked up ears when Mom mentioned ice cream.
典故来源
与'prick up _ ears'同源，强调耳朵竖起动作，源自动物本能反应。