Down \Down\, a. 1. Downcast; as, a down look. [R.] 2. Downright; absolute; positive; as, a down denial. [Obs.] --Beau. & Fl. 3. Downward; going down; sloping; as, a down stroke; a down grade; a down train on a railway. {Down draught}, a downward draft, as in a flue, chimney, shaft of a mine, etc. {Down in the mouth}, chopfallen; dejected.