Sässe, n.

(săs), n. [D. sas, from Fr. sas, a sieve, the basin of a waterfall. See SARSE.] A sluice, canal, or lock, on a navigable river. [Obs.] He is much concerned against Sir N. Cusp's project of making a great sasse in the king’s lands about Deptford to be a wet-dock. Pepys.