spare-ribs (n.)youdaoicibaDictYouDict[spare-ribs 词源字典]
1590s, formerly also spear-ribs, from spare (adj.), here indicating probably "absence of fat;" or perhaps from Middle Low German ribbesper "spare ribs," from sper "spit," and meaning originally "a spit thrust through pieces of rib-meat" [Klein]; if so, it is related to spar (n.1).[spare-ribs etymology, spare-ribs origin, 英语词源]