clysen.
Etymology: apparently < French écluse: it may possibly go back to an aphetic Middle English cluse with ü : compare clow n.1, cluss n.
local.
1882 6 May 595 In the Reports of the Somerset Drainage Commissioners, the sluices and locks under their jurisdiction are called ‘Clyses’.
This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2018).