chaffer (n.)youdaoicibaDictYouDict[chaffer 词源字典]
"a bargain," early 13c., cheffare "buying and selling," also (14c.) cheapfare, probably from Old English ceap "bargain, traffic, gain, sale" (see cheap) + faru "faring, going" (see fare (n.)). In later use, "haggling." The verb is recorded from mid-14c.[chaffer etymology, chaffer origin, 英语词源]