English

Noun

contango day ‎(plural contango days)

1. (obsolete, London Stock Exchange) The second day before payment of a contango debt is due.^[1]
   • 1968, P. G. Wodehouse, 'Do Butlers Burgle Banks?', Everyman, London: 2005, p 156.

     'Let's see, when is next contango day?' asked Ferdie.

References

1. ↑ Mitchell, James (1908) Significant Etymology (or Roots, Stems, and Branches of the English Language), William Blackwood and Sons, page 302: “...contango day, the second day before settling day.”