Sap. in Military Engineering, is a narrow ditch or trench by which approach is made from the foremost parallel towards the glacis or covert-way of a besieged place (see SIEGE). For Sappers and Miners, see ENGINEERS.
Sap.
Chambers's Encyclopaedia, Volume 9: Bound to Swansea, p. 159
Source scan(s): p. 0170