sha.yit denotes an oar, explicitly pictured with a fleet in a scene of broad waterways.

The noun is clearest as an oar in Isaiah 33:21, where a fleet with an oar is excluded from broad rivers and streams; in Isaiah 28:15 it occurs in the clause about an overflowing whip passing through, but the translation does not isolate its contribution.

1. Oar in a waterway scene · dominant

   In Isaiah 33:21, the masculine singular absolute form occurs in the clause concerning a fleet and passage through broad rivers and streams; the APB renders the scene, “no fleet with oar will go in it.” In Isaiah 28:15, the same noun form occurs in a statement about an overflowing whip passing through, though the APB does not make the noun’s specific contribution identifiable.

   Isaiah 33:21Isaiah 28:15

In the Anselm Project Bible: The APB explicitly includes “oar” in Isaiah 33:21. In Isaiah 28:15, its rendering of the overflowing-whip clause does not permit a word-by-word identification of the noun.