ἐφίππιον
From LSJ
ἢν εὑρίσκῃ πλέω τε καὶ μέζω τὰ ἀδικήματα ἐόντα τῶν ὑπουργημάτων, οὕτω τῷ θυμῷ χρᾶται → it happens that the crimes are greater and more numerous than the services, when one gives way to anger
Russian (Dvoretsky)
ἐφίππιον: τό конская попона, чепрак Xen., Luc., Plut.