Synonyms for Sap (same or very similar meaning)
WordNet sense 1 (a person who lacks good judgment):
fool, muggins, saphead, tomfoolWordNet sense 2 (a piece of metal covered by leather with a flexible handle; used for hitting people):
blackjack, coshWordNet sense 3 (deplete):
exhaust, tire, run down, play outFrom the ODE community, based on WordNetadd/edit