Synonyms of perk up in English:

perk up

See UK English definition of perk


1‘as he thought about the evening ahead he perked up slightly’

cheer up, brighten, brighten up, become more cheerful, become livelier, feel happier, take heart, be heartened, liven up, revive
improve, get better, recover, rally, take a turn for the better, look up, pick up, bounce back, be on the mend
informal buck up