We found 2 dictionaries that define the word perk up one's ears:

General (2 matching dictionaries)

1. perk up one's ears: Merriam-Webster
2. perk up one's ears: Wiktionary

Definitions from Wiktionary (perk up one's ears) ▸ verb:  Synonym of prick up one's ears ▸ Words similar to perk up one's ears ▸ Usage examples for perk up one's ears ▸ Idioms related to perk up one's ears ▸ Wikipedia articles (New!) ▸ Words that often appear near perk up one's ears ▸ Rhymes of perk up one's ears ▸ Invented words related to perk up one's ears