Ask at the forum if you have an Ancient or Modern Greek query!

σῷ

Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

French (Bailly abrégé)

dat. sg. masc. et neutre, ou nomin. masc. pl. att. de l’adj. σῶς.

Russian (Dvoretsky)

σῷ:
1) dat. sing. m и n к σός;
2) атт. (стяж. к σῶοι) nom. pl. m к σός.

Dutch (Woordenboekgrieks.nl)

σῷ Att., contr. van σῶοι, zie σῶς.