LWOST

English Noun - en nautical en low water ordinary spring tides. en 1948 September and October Weekend Works in the Severn Tunnel Railway Magazine 298 At high tide, 2¼ miles of the tunnel are under water, but at low tide, a wide expanse of rocks is left uncovered, and the main stream of the river flows through a channel 55 ft. deep at l.w.o.s.t., but little more than ¼ mile wide, known as the Shoots, some 1½ miles from the eastern (Gloucestershire) bank.