swordyoudaoicibaDictYouDict[sword 词源字典]
sword: [OE] Sword comes from a prehistoric Germanic *swertham, which also produced German schwert, Dutch zwaard, Swedish svärd, and Danish sværd. It is not known what its ultimate source was, although it has been speculated that it may have links with Old High German swerdo ‘pain’ – in which case its etymological meaning would be the ‘stinger, causer of pain’.
[sword etymology, sword origin, 英语词源]
sword (n.)youdaoicibaDictYouDict
Old English sweord, swyrd (West Saxon), sword (Northumbrian) "sword," from Proto-Germanic *swerdam (cognates: Old Saxon, Old Frisian swerd, Old Norse sverð, Swedish svärd, Middle Dutch swaert, Dutch zwaard, Old High German swert, German Schwert "a sword"), related to Old High German sweran "to hurt," from *swertha-, literally "the cutting weapon," from PIE root *swer- (3) "to cut, pierce."

Contrast with plowshare is from the Old Testament (Isaiah ii:4, Micah iv:3). Phrase put (originally do) to the sword "kill, slaughter" is recorded from mid-14c. An older Germanic word for it is in Old Saxon heoru, Gothic hairus "a sword."