Just keep your dauber up and your mouth shut.

打起精神, 闭住嘴。

A shower would soon perk you up.

冲个淋快就会打起精神的。

He felt that he had to drag himself out of his lethargy and begin to write.

他觉得自己必须打起精神，开始写作。

Come, bestir yourself!

! 打起精神来。