From Longman Dictionary of Contemporary Englishliven up phrasal verb1 EXCITEDto become more exciting, or to make an event become more exciting The party really livened up when Mattie arrived.liven something ↔ up Why don’t we invite Jane? That’ll liven things up!2 INTERESTING liven something ↔ up to make something look, taste etc more interesting SYN brighten up Why not liven up the room with some flowers?3 INTERESTEDEXCITEDto become more interested or excited, or to make someone feel like this After a few drinks she livened up a little. → liven→ See Verb table
Examples from the Corpus
liven up• I wish Leo would come - he would liven the party up.• Bob tried to liven things up by telling some of his jokes.• Tropical fruit such as mangoes and kiwis can help to liven up salad. 