ἔμβα
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
Poet. aor. 2 imper. of ἐμβαίνω.
Greek (Liddell-Scott)
ἔμβα: Ἀττ. ἀντὶ τοῦ ἔμβηθη, προστακτ. τοῦ ἀορ. β΄ τοῦ ἐμβαίνω.