1. 使有生气：lively 活泼的 | liven up 使有生气 | liven 有活力

2. 热闹：Hustle and bustle 熙熙攘攘 | liven up 热闹 | be there or be square 不见不散

3. liven up的解释

3. 使活跃起来：light up (使)容光焕发,满面春风,神采奕奕 | liven up 使活跃起来 | heat up 逐渐加热,热起来

1. （使)(某地或某事）有生气；（使）变热闹
    If a place or event livens up, or if something livens it up, it becomes more interesting and exciting.

    e.g. How could we decorate the room to liven it up?...
           我们怎么才能把这房间装饰得更有生气呢？
    e.g. The multicoloured rag rug was chosen to liven up the grey carpet...
           选择这块五彩缤纷的碎呢小毯是为了给这灰色的地毯添些生气。

2. （使）（某人）愉快起来；（使）活跃起来
    If people liven up, or if something livens them up, they become more cheerful and energetic.

    e.g. Talking about her daughters livens her up...
           谈到她的女儿时，她的心情愉快起来。
    e.g. George livens up after midnight, relaxing a little.
           午夜过后，乔治来了劲，人也活跃起来。

1. make lively

    e.g. let''s liven up this room a bit

    Synonym: enlivenliveninvigorateanimate