ALL meanings of sapping
sap
S s - noun sapping Fortification. a deep, narrow trench constructed so as to form an approach to a besieged place or an enemy's position. 1
- verb with object sapping Fortification. to approach (a besieged place or an enemy position) by means of deep, narrow trenches protected by gabions or parapets. to dig such trenches in (ground). 1
- verb with object sapping to undermine; weaken or destroy insidiously. 1
- verb without object sapping Fortification. to dig a sap. 1