drain, run out -- (flow off gradually; "The rain water drains into this big vat")
drain -- (deplete of resources; "The exercise class drains me of energy")
drain -- (empty of liquid; drain the liquid from; "We drained the oil tank")
enfeeble, debilitate, drain -- (make weak; "Life in the camp drained him")
Overview of adj drained
The adj drained has 3 senses
drained -- (emptied or exhausted of (as by drawing off e.g. water or other liquid); "a drained marsh"; "a drained tank"; "a drained and apathetic old man...not caring any longer about anything")