go further

1) to say or do something more extreme

By sending Lister to prison, the judge went further than the law normally allows.

go one step further:

Most historians use archives but Professor Bramanti has gone one step further by creating his own.

2) to continue telling someone something

I'm going to stop you before you go any further.

3) not go any further or go no further if you do not want something to go any further, you do not want anyone else to be told about it

This is sensitive information – please don't let it go any further.