chithappens
Senior Member
It's translates best as "make this one bigger."
In context, it really probably didn't make much of a difference to the translators though since it wouldn't make sense for him to start over if Naruto was already inside of it, but certainly it's not something like "make a new one bigger."
Edit: "sara" is the part that is probably what makes them say that because it can be used to mean, "'(*condition* 'sara'/if this continues, then blah blah blah)". But it simply mentions making it bigger rather than making a new version of the jutsu bugger.