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Use "trenching" in a sentence
"A method called trenching, is good because it is so thorough."
"Mary does not talk of the garden; it may well be a disagreeable subject to her, but her husband is persuaded that nothing is wanting to make the first new one good but trenching, which is to be done by his own servants and John Bond, by degrees, not at the expense which trenching the other amounted to."
"A kind of trenching of the ground is resorted to; they hoe deep, and draw it well to themselves: this exposes the other earth to the hoe."