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From LSJ

σιγᾶν ἄμεινον ἢ λαλεῖν ἃ μὴ πρέπει → it's better to keep silence than to say what's not appropriate (Menander)

Source

Russian > Greek

διαχειρίζω, ἐπιτροπεύω, ἐπιμελέομαι