ἑταιρέω
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)
A keep company with, Aeschin.1.13, Phoenicid.4.2 ; τινι with a man, And.1.100, etc.; φιλία ἑταιροῠσα meretricious friendship, Plu. 2.62d; οἱ πολλοὶ αὐτῶν ἡταιρήκασιν Lys. 14.41 ; οὐκέτι φαίνεται μόνον ἡταιρηκώς, ἀλλὰ καὶ πεπορνευμένος Aeschin.1.52. II Med., = ἑταιρεύομαι, of men, Theopomp.Hist.217b ; of women, Plu. Ant.18.