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
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012