sheathe (v.)youdaoicibaDictYouDict[sheathe 词源字典]
c. 1400, "to furnish (a sword, etc.) with a sheath," from sheath; meaning "to put (a sword, etc.) in a sheath" is attested from early 15c. Related: Sheathed; sheathing.[sheathe etymology, sheathe origin, 英语词源]