[quote author=Tim Ward link=board=etymology;num=1068485950;start=0#1 date=11/10/03 at 18:44:03]SO… It appears clearly to have come from the French, most recently, into English; thus, the soft ‘sh’ is correct, rather than the hard ‘ck’.
Certainly, a hard ‘ck’ is not justified. Whether to adopt a ‘sh’ could depend on how the rest of the word is treated. If the rest of the pronunciation is consistent with gauche, then certainly the ‘sh’ applies.
However, I have heard the word used with a much rougher (British) English treatment so that ‘debauch’ rhymes with ‘scorch’ and ‘debauchery’ follows this same line. But, as so often happens, perhaps this is an issue of left- and right-pondianism?