holus-bolus
Concise Oxford English Dictionary © 2008 Oxford University Press:
holus-bolus /ˌhəʊləsˈbəʊləs/
▶adverb N. Amer. or archaic all at once.
– origin C19 (orig. dial.): perh. pseudo-Latin for ‘whole bolus, whole lump’.
'holus-bolus' also found in these Oxford entries:

