Английский Этимологический словарь - hash (v.)

- 1657, "to hack, chop," from O.Fr. hache "axe." The noun "stew" is first recorded 1662, from the verb. Hash, short for hashish, is first recorded 1959 Amer.Eng. The hash marks on a football field were so called 1960s, from similarity to hash marks, armed forces slang for "service stripes on the sleeve of a military uniform" (1909), supposedly called that because they mark the number of years one has had free food (hash) from the Army.