TgJ Ez27:25 :בִספִינֵי יַמָא הֲווֹ שָיְטִין וֻמֵיתַן סְחוֹרָא לְגַוִיך‏ : they were sailing on sea-going ships and bringing merchandise to your midst
See the entire entry for šwṭ vb. to go about floating