of a surety

English

(archaic) For certain.
- 1526, [William Tyndale, transl.], The Newe Testamẽt […] (Tyndale Bible), [Worms, Germany: Peter Schöffer], →OCLC, Acts xij:[11], folio clxxij, recto:
  And whẽ Peter was come to hym ſilfe / he ſayde: nowe I knowe off a ſurety / that the lorde hath ſent his angell […]
- 1815 February 24, [Walter Scott], chapter LI, in Guy Mannering; or, The Astrologer. […], volume III, Edinburgh: […] James Ballantyne and Co. for Longman, Hurst, Rees, Orme, and Brown, […]; and Archibald Constable and Co., […], →OCLC, page 235:
  Of a surety, little Harry, we must speedily resume our studies.