The Collaborative International Dictionary
make water
make water \make water\, v. i.
(Naut.) To leak.
To urinate; -- a euphemism.
Wiktionary
make water
vb. 1 (context slang euphemistic English) To urinate. 2 (context nautical English) To admit water; to leak.
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]