The diversion of baiting an author has the sanction of all ages and nations, and is more lawful than the sport of teasing other animals, because, for the most part, he comes voluntarily to the stake, furnished, as he imagines, by the patron powers of literature, with resistless weapons, and impenetrable armour, with the mail of the boar of Erymanth, and the paws of the lion of Nemea.
A dash derives from "to dash," to shatter, strike violently, to throw suddenly or violently, hence to throw carelessly in or on, hence to write carelessly or suddenly, to add or insert suddenly or carelessly to or in the page. "To dash" comes from Middle English daschen, itself probably from Scandinavian-compare Danish daske, to beat, to strike. Ultimately the word is-rather obviously-echoic.
Not only the tools of manual labour, but also the tools of human thought — words — are subject to the laws of historical development. The history of the meanings of words is outside the area of interest of formal logic, and could not be fruitfully studied by the methods of that discipline.