Definition of "on account"

on account

prepositional phrase
1. As something to be reckoned up as part of final payments; on credit.
conjunction
1. (colloquial) On account of the fact that; because.
  Quotations
  Take your three days off, Mr. Barlow, only don't expect to be paid for them on account you're thinking up some fancy ideas.
  1948, Evelyn Waugh, The Loved One
  ‘Well, we come on this pisswater river, running high on account there'd been rains.’
  1999, George R.R. Martin, A Clash of Kings, Bantam, published 2011, page 466