relieve_oneself
1. [ verb ] eliminate urine
Synonyms: piss pass_water puddle micturate urinate wee pee-pee make_water take_a_leak spend_a_penny pee wee-wee piddle make
Examples:

"Again, the cat had made on the expensive rug"

Related terms: excrete wet stale defecate urinate urine peeing micturition pisser