enfeeble (v.)youdaoicibaDictYouDict[enfeeble 词源字典]
"to cause to weaken, deprive of strength," mid-14c., from Old French enfeblir "become weak," from en- (see en- (1)) + feble (see feeble). Related: Enfeebled; enfeebling; enfeeblement.[enfeeble etymology, enfeeble origin, 英语词源]