Hack \Hack\, n. 1. A notch; a cut. --Shak. 2. An implement for cutting a notch; a large pick used in breaking stone. 3. A hacking; a catch in speaking; a short, broken cough. --Dr. H. More. 4. (Football) A kick on the shins. --T. Hughes. {Hack saw}, a handsaw having a narrow blade stretched in an iron frame, for cutting metal.