unharness (v.)youdaoicibaDictYouDict[unharness 词源字典]
mid-15c., "divest of armor," from un- (2) "opposite of" + harness (v.). Similar formation in Dutch ontharnassen "to disarm." Meaning "to free (a horse) from harness" is recorded from 1610s. Related: Unharnessed; unharnessing.[unharness etymology, unharness origin, 英语词源]