The Collaborative International Dictionary of English v.0.48:

Cosher \Cosh"er\ (k?sh"?r), v. t. [Ir. cosair a feast, a
   banquet? or cf. F. coucher to lie. Cf. Couch, Coshering.]
   1. (Old Law) To levy certain exactions or tribute upon; to
      lodge and eat at the expense of. See Coshering.
      [1913 Webster]

   2. To treat with hospitality; to pet. [Ireland]
      [1913 Webster]

WordNet (r) 3.0 (2006):

cosher
    adj 1: conforming to dietary laws; "kosher meat"; "a kosher
           kitchen" [syn: kosher, cosher]