Unknown. Possibly of Ancient Greek origin, from ὅλος (hólos, “whole”) and βόλος (bólos, “a throw with a casting net”), or βῶλος (bôlos, “lump”). May have been Latinized (i.e., -us ending as in masculine singular in Latin, as opposed to -os ending for masculine singular in Greek).
- All together; entirely; without modification.
- to accept a story holus-bolus.