Answer: moldboards

AnswerCrossword Clue
moldboardsA similar device on the front of a snowplow or bulldozer, used for pushing snow or loose earth
moldboardsMOLDBOARD, a curved plate of iron (originally of wood) back of the share of a plow, which turns over the earth in plowing also MOULDBOARD
moldboardsA curved metal blade in a plow that turns the earth over