Source : WordNet®

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