Noah Webster
Trenching
TRENCH'ING, participle present tense Cutting into trenches; digging; ditching.
TRENCH'-PLOW, noun [trench and plow.] A kind of plow for opening land to a greater depth than that of common furrows.
TRENCH'-PLOW, verb transitive [trench and plow.] To plow with deep furrows.
TRENCH'-PLOWING, noun The practice or operation of plowing with deep furrows, for the purpose of loosening the land to a greater depth than usual.