Perhaps H.L. Mencken said it best:
The cocktail to multitudes of foreigners, seems to be the greatest of all the contributions of the American way of life to the salvation of humanity, but there remains a good deal of uncertainty about the etymology of its name and even some doubt that the thing itself is of American origin.
Nowadays, we’re somewhat more certain that the word is American in origin than Mencken was, but there is still considerable question about its exact etymology. The explanation best supported by the evidence is that the noun meaning a mixed, spirituous drink is taken from an earlier adjectival use meaning something stimulating or that would “cock one’s tail.”
Copyright 1997-2013, by David Wilton