† lock-hatchn.Obsoleterare a paddle or sluice forming part of the gate of a canal or river lock. [Earlier currency is perhaps implied by the place name Lockehatch Corner, Epping, Essex (1570; now lost) and Lock Hatches, Southampton, Hampshire (1849; now lost).]
ΚΠ
1868 Technologisches Wörterbuch III. 247/1 Sluice-board, lock-hatch, sluice-stay.