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perk up (one's/someone's) ears

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perk up (one's/someone's) ears

1. Of oneself, 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. Of someone else, to cause him or her to become so. I bet I know something that will perk up your ears: Rob is single again!

See also: ear, perk, up