憋尿

憋尿	biē niào	to hold in one's pee; to hold back from urinating
憋	biē	to choke / to stifle / to restrain / to hold back / to hold in (urine) / to hold (one's breath)
尿	niào	to urinate / urine / CL:泡
尿	suī	(coll.) urine