make water

from WordNet (r) 3.0 (2006)

make water
    v 1: eliminate urine; "Again, the cat had made on the expensive
         rug" [syn: {make}, {urinate}, {piddle}, {puddle},
         {micturate}, {piss}, {pee}, {pee-pee}, {make water},
         {relieve oneself}, {take a leak}, {spend a penny}, {wee},
         {wee-wee}, {pass water}]

from The Collaborative International Dictionary of English v.0.48

make water \make water\, v. i.
   1. (Naut.) To leak.
      [1913 Webster]

   2. To urinate; -- a euphemism.
      [1913 Webster]