salesman (n.)youdaoicibaDictYouDict[salesman 词源字典]
1520s, from genitive of sale (compare craftsman, tradesman) + man (n.).[salesman etymology, salesman origin, 英语词源]
salesmanship (n.)youdaoicibaDictYouDict
1853, from salesman + -ship.
The modern system of salesmanship has become so much like persecution reduced to a science, that it is quite a luxury to be allowed the use of your own discretion, without being dragooned, by a shopkeeper's deputy, into looking at what you do not care to see, or buying what you would not have. A man in his sane mind, with the usual organs of speech, has a right to be treated as if he knows what he wants, and is able to ask for it. ["The Literary World," Feb. 26, 1853]
salesperson (n.)youdaoicibaDictYouDict
1920, from genitive of sale + person.
saleswoman (n.)youdaoicibaDictYouDict
1704, from genitive of sale + woman.