make water \make water\, v. i.

1. (Naut.) To leak. [1913 Webster]

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

Source: The Collaborative International Dictionary of English v.0.48
 

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]

Source: WordNet (r) 2.0