1610s, "special messenger," from express (adj.). Sense of "business or system for sending money or parcels" is by 1794.
also moola, "money," c. 1920, American English slang, of unknown origin. Earlier it was a form of the Islamic title mullah.
"to put up bail money," 1781, from one of the nouns post, but which one is uncertain. Related: Posted; posting.
"made firm, solid, hard, or compact," 1736, past-participle adjective from consolidate. Of bills in parliament, 1741; of money, debt, etc., 1753.
"one who checks or controls," especially "one who collects money for others," 1867, agent noun from check (v.2).
1857, racing slang, "to refuse or avoid payment of money laid as a bet," probably a disparaging use of the national name Welsh. Related: Welched; welching.