fall

In Scotland, 14th century – 19th century, a unit of length used in surveying, = 6 ells = 222 inches, about 5.6388 meters. Also called a raip (rope) or rod.

Like many lineal units, the fall was often used as a unit of area (about 342.25 square English feet), without a qualification like "square":

6: Ells long, and 6 Ells breadth, makes a superficiall or square fall, wherewith land is reckened. ... 40 Falls makes a Roode. ... 4 Roodes is an Acre. So an Acre contains 160 Falls, or 960 Ells.