pull your socks up可不是“拉起袜子”，真正的意思是振作起来，加把劲。

【例句】
So I'm telling you guys& you have to pull your socks up and get out and sell more stuff, or you'll be looking for new jobs this summer.
所以我告诉你们，你们赶快振作起来到外面去加紧推销。否则，你们今年夏天就要另外找工作了。

If you want to be promoted next month, you'd better pull your socks up.
如果你想下个月被提升，你最好还是加把劲。