duús in

Old Irish

Contracted from do ḟius in (literally “for knowledge whether”).

if by chance
- c. 800, Würzburg Glosses on the Pauline Epistles, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. I, pp. 499–712, Wb. 5^b20
  trisin intamail sin .i. combad ǽt leu buid domsa i n-iriss et duús in intamlitis
  through that imitation, i.e. so that there may be jealousy with them for me to be in faith and if by chance they might imitate [me]
to see whether, to find out whether
- c. 800–825, Diarmait, Milan Glosses on the Psalms, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. I, pp. 7–483, Ml. 91^c1
  No scrútain-se, in tan no mbíinn isnaib fochaidib, dús in retarscar cairde ṅDǽ ⁊ a remcaissiu, ⁊ ní tucus-sa insin, in ru·etarscar fa naic.
  I used to consider, when I was in the tribulations, [to see] whether the covenant of God and his providence had departed, and I didn't understand that, whether it had departed or not.

Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “1 dús”, in eDIL: Electronic Dictionary of the Irish Language
Thurneysen, Rudolf (1940) D. A. Binchy and Osborn Bergin, transl., A Grammar of Old Irish, Dublin Institute for Advanced Studies, →ISBN, § 463, page 291; reprinted 2017