Glossary
K
Knapped flint
Flint that has been deliberately struck to present an approximately flush face for aesthetic purposes (cf fractured flint). Nodules are broken ('quartered') into workable pieces along the natural lines of fracture. For the finest work, this is followed by chipping away ('flaking') to even the surface and square the end.
Knocking up
Reworking mortar that has been stiffened up in order to restore the workability.