напрягать все силы

From LSJ

θαρσεῖν χρὴ φίλε Βάττε: τάχ' αὔριον ἔσσετ' ἄμεινον → you need to be brave, dear Battus; perhaps tomorrow will be better | Take heart, dear Battos! Tomorrow will be better.

Source

Russian > Greek

κατατείνω, περιβιάζομαι, συνακμάζω