or sure thing, subs. phr. (colloquial).A certainty; anything entirely trustworthy (B. E.).
1537. Thersites [DODSLEY, Old Plays (HAZLITT), i. 363]. This is a SURE CARD, this piece of work.
1579. J. LYLY, Euphues (1636), A. IV. A cleere conscience is a SURE CARD.
1589. R. HARVEY, Plaine Percevall, 12. To get a SURE CARD on their side, either calles for Justice.
1593. SHAKESPEARE, Titus Andronicus, v. 1. 100. AS SURE A CARD as ever won the set.
1613. FLETCHER, The Captain [quoted by GIFFORD, Jonson, ii. 284]. For. You know the juggling captain? Clown. Ay; theres a SURE CARD.
1672. RAY, Proverbs, Entire Sentences. A clear conscience is a SURE CARD.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v. A SURE CARD, a trusty Tool, or Confiding Man.
1725. N. BAILEY, trans. The Colloquies of Erasmus, i. Of a Soldiers Life. To be sure that Christopher the Collier was a SURE CARD to trust to.
1742. FIELDING, Joseph Andrews, IV. iii. We have one SURE CARD, which is to carry him before Justice Frolick.