It might originally be from the obsolete interjection Christ's foot!, though the latest citation in the OED is dated 1662.— VERBATIM: The Language Quarterly Vol XIX No 1
The earliest citation for this sense of die in the OED is indeed from 1591; the Supplement adds no citations.— VERBATIM: The Language Quarterly Vol XIV No 3
One other matter that crops up as a continual source of annoyance in books written by amateurs and based on evidence adduced in, for instance, the Oxford English Dictionary: the earliest citation given in the OED is not necessarily -- and certainly not probably -- the first time a given word was used, merely the earliest written evidence that OED's citation readers were able to find for a form.— VERBATIM: The Language Quarterly Vol VIII No 4
The earliest example of blackleg in its strike-breaking sense found by the OED is as late as 1889: "The question of the preparation of a list of master-baker ` blacklegs 'was also touched upon.— VERBATIM: The Language Quarterly Vol XIII No 4
The earliest citation in the OED is for 1926.— VERBATIM: The Language Quarterly Vol IV No 2
Oed has been looked up 78 times, favorited 0 times, listed 0 times, commented on 0 times, and is not a valid Scrabble word.