ἐπεμβατήρ
From LSJ
Μὴ φεῦγ' ἑταῖρον ἐν κακοῖσι κείμενον → Ne fuge sodalem, cum calamitas ingruit → Lass einen Freund in Schwierigkeiten nicht im Stich
English (LSJ)
ῆρος, ὁ, = ἐπεμβάτης (one mounted, horseman, one who walks on, one who walks in) ; v. ἐπαμβατήρ.
Greek (Liddell-Scott)
ἐπεμβᾰτήρ: ὁ, = ἐπεμβάτης· ἴδε ἐπαμβατήρ.