Synonyms for Drain (same or very similar meaning)
WordNet sense 1 (a pipe through which liquid is carried away):
drainpipe, waste pipeWordNet sense 2 (flow off gradually):
run outWordNet sense 3 (emptying something accomplished by allowing liquid to run out of it):
drainageWordNet sense 4 (make weak):
debilitate, enfeebleFrom the ODE community, based on WordNetadd/edit