*osher*

n. One who coshers. [ 1913 Webster ]

n. (Old Law) A feudal prerogative of the lord of the soil entitling him to lodging and food at his tenant's house. Burrill. [ 1913 Webster ]

Sometimes he contrived, in deflance of the law, to live by coshering, that is to say, by quartering himself on the old tentants of his family, who, wretched as was their own condition, could not refuse a portion of their pittance to one whom they still regarded as their rightful lord. Macaulay. [ 1913 Webster ]

n. [ OE. gosherde. See Goose, and Herd a herdsman. ] One who takes care of geese. [ 1913 Webster ]

a. [ heb. koshër fit, proper. ] 1. Ceremonially clean, according to Jewish law; -- applied to food, esp. to meat of animals slaughtered according to the requirements of Jewish law. Opposed to tref. For food to be officially kosher, it must be certified fit to eat by a Rabbi, according to Jewish ritual law; as, kosher food. Hence, designating a shop, store, house, etc., where such food is sold or used; as, a kosher restaurant.
Syn. -- cosher, ritually fit, sanctioned. [ Webster 1913 Suppl. ]

2. Hence: Proper; seemly; appropriate; legitimate; as, it's not kosher to do it that way. [ colloq. ] [ PJC ]

3. Genuine. [ colloq. ] [ PJC ]

n. Kosher food; also, a kosher shop. [ Webster 1913 Suppl. ]

2. the practise of adherence to the Jewish ritual law; used mostly in the phrase
keep kosher, v. i.. [ PJC ]

keep kosher To adhere to the rules for eating only kosher food and handling it properly. [ PJC ]