Proto-IE: *twerǝ-
Meaning: to keep, to hold, to fence
Old Greek: soró-s f. `Graburne, Sarg', sei̯rǟ́ (dor. sērá Gramm.) `Seil, Strick, Schlinge, Lasso', {serís `belt' (Hsch.) - not found!}
Russ. meaning: держать, обвязывать, огораживать
References: WP I 750 f