syne (norwegian), n., 1. Sight; 2. Call; snye n. Canadian (chiefly Ontario). 1. a backwater. 2. a side-channel, esp. one that later rejoins the main stream. 3. a channel joining two rivers.; syne (scots), adv., 1. Before now; ago., 2. Afterward; since then; since., 3. Thereupon; next.; snye n, 1. (Physical Geography) Canadian a side channel of a river.; nice shot, ey!