perk up (one's) ears

perk up (one's) ears

1. To become more or particularly alert, intrigued, or enthusiastic. I perked up my ears when I heard that my favorite author had a new book coming out.2. To cause one to become more or particularly alert, intrigued, or enthusiastic. I bet I know something that will perk up your ears: Rob is single again!See also: ear, perk, up