What are the implications of "ve'Nasav" and "ve'Yatza" in the current context?
Rashi: They mean that the border moved outwards,
rendering the town mentioned next to it
inside the border.
The southern border currently under discussion
What is the meaning of "Totz'osav"?
Rashi: It means 'the extremity'.
And what are the implications of "Veyatza Chatzar Adar"?
Rashi: It implies that the border expanded.
See Sifsei Chachamim. It is not clear however, why the Torah does not then use the Lashon 've'Nasav' or 've'Yatza'?