コン

ground-breaking, open up farmland

JLPT1 G7 S16 F5000

貇 combines 艮 (adhere) with 豸 animal that ambles along the ground → teeth of a sharp-toothed beast adhering to an object or to the piece of food being gnawed → gnaw. is as per 貇# (adhere) + earth → agricultural tool adhering to the soil in *cultivation*.

[Full Kanji Etymology List]