bandyyoudaoicibaDictYouDict[bandy 词源字典]
bandy: [16] To ‘bandy words with someone’ may go back to an original idea of ‘banding together to oppose others’. The word comes from French bander ‘oppose’, which is possibly a derivative of bande ‘group, company’ (source of English band). The rather complex semantic development goes from ‘taking sides’, through ‘opposing a third party’, ‘exchanging blows’, ‘exchanging hits’ (in the 16th and 17th centuries it was a term in tennis), to ‘exchanging hostile words’.

The adjective bandy [17], as in ‘bandy legs’, probably comes from the noun bandy ‘curved stick used in an early form of hockey’ (the game was also known as bandy). It may ultimately be related to the verb bandy, the connection being the notion of knocking a ball to and fro.
=> band[bandy etymology, bandy origin, 英语词源]
bandy (v.)youdaoicibaDictYouDict
1570s, "to strike back and forth," from Middle French bander, from root of band (n.2). The sense apparently evolved from "join together to oppose," to opposition itself, to "exchanging blows," then metaphorically, to volleying in tennis. Bandy (n.) was a 17c. Irish game, precursor of field hockey, played with a curved stick (also called a bandy), hence bandy-legged (1680s).