Defile

dē-fīl′, or dē′fīl, v.i. to march off in file or line, or file by file.— n. a long narrow pa or way, in which troops can march only in file, or with a narrow front.— v.t. Defilāde′ , to plan a fortification so as to protect it from enfilading fire.— n. Defile′ment . [Fr. défiler —L. dis , and filum , a thread.]