What does it meaning in english? 《就》

Depending on what you want to say but sometimes it means exactly

It's better if you can provide the actual context. But I can first give you some examples:
我一起床就摔跤了。 一...就... as soon as
她要是早知道这个就好了。 it would be (nice if ....)
你把这两边对折起来就折完啦！ ... and it's (done!)
吃了头孢就不能喝酒了。 Once you ..., (you cannot drink alcohol).