- The sandy silt above the usual tide-line left after the high spring tides, as a result of which it had a high salt content. This silt was gathered into a trench known as a 'kinch', over which fresh water was passed. The resulting salt as brine was then drained in a wooden receptacle; this brine was taken to the boiling pan. The word 'slitch' was used in Lancashire and the Solway; in the Lincolnshire salt industry the equivalent word used was 'muldefang' or 'mould'. -Cf. Salt-pan
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.