late O.E.
sala "a sale," from O.N.
sala "sale," from P.Gmc.
*salo (cf. O.H.G.
sala, Swed.
salu, Dan.
salg), from root
*sal-, source of
*saljan (cf. O.E.
sellan; see
sell). Sense of "a selling of shop goods at lower prices than usual" first appeared 1866.
Salesman is from 1523;
salesmanship first attested 1880.