Turned over with the blade of a plough to create furrows (usually for planting crops). / (figuratively, rare) Well-trodden or well-researched, previously explored.

Real being; existence. / The act of maintaining oneself at a minimum level. / Inherency. / Something (food, water, money, etc.) that is required to stay alive.

(informal, derogatory) A lousy, disreputable, or disgusting place. / (informal, derogatory) A sleazy person.

(astronautics) The use of atmospheric drag to reduce the velocity of a spacecraft, especially so as to establish a stable orbit and to reduce fuel consumption.