n. 1. A movable section of a bridge, which may be raised up or turned toone side, so as to admit the passage of vessels. Gildersleeve v. Railroad Co. (D. C.) 82Fed. 766; Hughes v. Railroad Co.(C. C.) 18 Fed. 114; Railroad Co. v. Daniels, 90 Ga. 608, 17 S. E. 647.2. A depression in the surface of the earth, in the nature of a shallow ravine orgulch, sometimes many miles In length, forming a channel for the escape of rain andmelting snow draining into it from either side. Railroad Co. v. Sutherland, 44 Neb. 526,62 N. W. 859.