振作起来，come on . cheer up .

it's a common word,it only means "cheer up",for example, if I am sad because I failed my text,it would be nice of you to say "振作一点"to me.

It is quite a common word. 例句：他生意亏了，他受到很大的打击，他需发重新振作起来，以挽回败局。

It's very common word in China. It is used when you want to cheer up someone, like 振作起来.

not really "cheer up". I remember there is a saying like "put yourself together", not sure. it can be used either when someone become active and positive again from a bad or unfortunate situation, or sometimes, just used to wake someone who is being lazy. 他已经生病很长时间了，但总是尽量振作自己做些有意义的事情。 你总是这么懒散怎么可能有好的成绩，振作一点！