PERK

up (BECOME HAPPY) [phrasal verb] [I; M] - to (cause to) become happier, more energetic or activeShe perked up (= became happier) as soon as I mentioned that Charles was coming to dinner. [I]He perked up at (= became happier when he heard) the news. [I]Would you like a cup of coffee? It might perk you up a bit (= make you more energetic). [M]If you add a drop of rosemary oil to your bath, it will perk you up (= make you more active). [M](figurative) Share prices perked up (= increased) slightly before the close of trading. [I]