It literally translates to "stand up" and is used to tell someone to stand up from a seated or lying position.
Here are some examples of how it can be used:
* 站起來，我們要走了。 (Zhan qi lai, women yao zou le.) - Stand up, we need to go.
* 你站起來了嗎? (Ni zhan qi lai le ma?) - Have you stood up?
* 請站起來。 (Qing zhan qi lai.) - Please stand up.