perk up

动词verb

1. 1intransitiveTo become more upright
2. 2intransitiveTo become more lively or enthusiastic.
3. 3transitiveTo cause to be more upright, straighten up.
4. 4transitiveto cause to be more lively or enthusiastic.
5. 5intransitive, obsoleteTo exalt oneself, take on a higher status or position.