plough

a group of seven bright stars in the constellation Ursa Major

a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

move in a way resembling that of a plow cutting into or going through the soil; "The ship plowed through the water"

to break and turn over earth especially with a plow; "Farmer Jones plowed his east field last week"; "turn the earth in the Spring"