unburden (v.)youdaoicibaDictYouDict[unburden 词源字典]
1530s, "to unload" (transitive), from un- (2) "reverse of" + burden (v.). Similar formation in German entbürden. Reflexive sense is recorded from 1580s. Related: Unburdened; unburdening.[unburden etymology, unburden origin, 英语词源]