• (p. pr. & vb. n.) of Regrate
a term used to describe the redressing of salvaged or old stone. 
An act was passed against regrators, forestallers, and ingrossers in 1552. A regrator was one who bought victuals in a market and sold them again within four miles of the same place; a forestaller was one who bought goods on their way to market; an ingrosser was one who bought large quantities with intent to sell at a higher price. The offences wer...Regrating is a form of renovation carried out on stonework which involves the removal of the outer surface of an old hewn stone, so as to give it a fresh appearance.
Removing the surface of stone in place by some dressing method to clean by exposing fresh stone.