ἔρξω
From LSJ
γραμματική ἐστιν ἐμπειρία τῶν παρὰ ποιηταῖς τε καὶ συγγραφεῦσιν ὡς ἐπὶ τὸ πολὺ λεγομένων → grammar is a practical knowledge of the usage of poets and writers of prose
English (LSJ)
ἔρξα,
A v. ἔρδω.
German (Pape)
[Seite 1033] fut. zu ἔρδω, eigtl. von ἔργω.
Greek (Liddell-Scott)
ἔρξω: ἔρξα, ἴδε ἔρδω.