а. поднять/навострить уши; The dog perked up its ears at the sound of its master's return. б. оживиться, воспрянуть духом; You need a holiday to perk you up. Mary perked up as soon as John's name was mentioned.
PERK UP
Англо-русский перевод PERK UP
Мюллер. English-Russian Muller's dictionary bed edition. Англо-Русский словарь Мюллера редакция bed. 2012