to leak (of water or gas) / to drip / to drain / to discharge / to leak out / to divulge (secrets) / to give vent (to anger, spite etc) / to disperse / to reduce
泄
=
世
+
氵
:
Marie Curie (xi) is putting up a poster by the WHO (世) in the elevator's bathroom (e4). It is alerting everyone that when filling your water bottle (氵) from the tap not a single drop is allowed to leak (泄) through the closed bottle.