file2, n., v., filed, fil·ing. –n. 1. a long, narrow tool of steel or other metal having a series of ridges or points on its surfaces for reducing or smoothing surfaces of metal, wood, etc. 2. a small, similar tool for trimming and cleaning fingernails; nail file. 3. Brit. Slang. a cunning, shrewd, or artful person. –v.t.