definition of
[plough]

[1] #1 plough n. [Big Dipper, Dipper, Plough, Charles's Wain, Wain, Wagon] a group of seven bright stars in the constellation Ursa Major. wn

[2] #2 plough v. [plow] move in a way resembling that of a plow cutting into or going through the soil; "The ship plowed through the water". wn

[3] #3 plough n. [plow] a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing. wn

[4] #4 plough v. [plow, turn] to break and turn over earth especially with a plow; "Farmer Jones plowed his east field last week"; "turn the earth in the Spring". wn