sap

[1]	bleed , drain , draw , tap , rob , milk
[2]	run down , exhaust , play out , tire

[1]	(vital) juice/fluid , bodily/(US) body fluid , lifeblood , essence , (Literary) ichor
[2]	fool , fool , saphead , idiot , nincompoop , muggins , tomfool , ninny , ninny-hammer , simpleton , ignoramus , nitwit , dim-wit , dunce , ass , dupe , gull , (US) thimble-wit , (Colloq) chump , drip , (Brit) (right) charlie , noddy , noodle , wet , (Mainly Brit) twit , (Slang) patsy , sucker , (easy) mark , pushover , sap-head , (Brit) muggins , (US) schnook , schlemiel/schlemihl/shlemiel , fall guy
[3]	blackjack , cosh