To cut across.n. A direct course from one point to another, crosswise or diagonal to another or the usual one; a shortened road or path.n. In mining: A level driven across the “country,” or so as to connect two levels with each other.n. A trench or opening in the surface-detritus or -soil, at right angles to the supposed course of the lode, made for the purpose of ascertaining the exact position and nature of the latter.Adapted or used for cutting anything crosswise: as, a cross-cut saw or chisel.Cut across the grain or on the bias: as, cross-cut crape.To cross-plow, as in fallowing.n. In mathematics, a line, regarded as a section actually made in the surface, which begins at one point of a boundary, goes into the interior of the surface, and, without anywhere intersecting either another boundary-line or itself, ends at a point of the boundary.