Rashi: Like the great boats that they distance them [from the shore] into the middle of the sea. Because it is full and heavy, "an east wind comes and breaks it in the heart of the sea." This is like the city ? because it was full of wealth, it became haughty and punishments came upon it.

Radak: Shatim refers to Shalal (booty). The Targum of "va'Yivez" (Bereishis 25:34) is v'Shat. Bizah and Shalal are the same. Great water is a metaphor for afflictions; it is as if it says b'Tzaros Rabos Hevi'uch.

Radak citing Targum Yonasan: Great water came upon you and plundered you.

Malbim: Tzidon and Arvad used to be "Shatim Lach" (8 - sailed for you, to bring merchandise to you). They brought you in great water. Tzidon had a hand in the fall of Tzor ? "Domu Yoshevei Iy Socher Tzidon; ? Boshi Tzidon" (Yeshayah 23:2 4). Tzidon envied the grandeur of Tzor; they helped to make it fall.

Radak: It breaks boats of Tarshish. Therefore the strong one (Nebuchadnetzar) is compared to an east wind. Also Yonason translates 'a king strong like an east wind?'

Malbim: At the time of a storm, if the boat is close to the coast, there is hope, but not if it is in the middle of the sea.