Mozu is one of the Square Sisters of the Franky Family. As such, she is able to fend off enemy attacks, or attacking with a sword along with Kiwi.
Sentei Kaitai GiriKanji: 船底解体斬り
Translation: Bilge Dismantling Cut
Kiwi and Mozu coordinated make some superficial symmetrical cuts on an objective. The "bilge" is the ship's bottom part.