BT Yom 77b(36) :שכן בבבל קורין לשייטא סחוא‏ : because in Babylonia they call the שייטא [i.e. swimmer in JPA] סחוא
See the entire entry for šayyāṭ, šayyāṭā n.m. swimmer; sailor

BT Yom 77b(36) :מאי סחו ,, שיטא‏ : what is סחו? swimming
See the entire entry for šyāṭ, šyāṭā v.n. traveling, swimming