oxbow (n.)youdaoicibaDictYouDict[oxbow 词源字典]
also ox-bow, mid-14c., "wooden collar for an ox," from ox + bow (n.1). Meaning "semicircular bend in a river" is from 1797, American English (New England); meaning "curved lake left after an oxbow meander has been cut off by a change in the river course" is from 1898. The reference is to similarity of shape.[oxbow etymology, oxbow origin, 英语词源]