a. (UN-1 7 b.)
1875. Mrs. Oliphant, Valentine & His Brother, xviii. 169. The distance between them,—the tremendous and uncrossable gulf between his state and hers.
1882. R. H. Patterson, New Golden Age, I. iv. 112. Where Kit Carson or some other famous backwoodsman, who had been trapping beyond the Rocky Mountains, told of his adventures in the hardly known region beyond the almost uncrossable mountain-wall.
