φῦ
From LSJ
Ἐχθροὺς ἀμύνου μὴ ‘πὶ τῇ σαυτοῦ βλάβῃ → Ulciscere hostem, non tamen damno tuo → Die Feinde wehre ohne Schaden für dich ab
English (LSJ)
A fie! faugh! an exclam. of disgust, Ar.Lys.295,305, cj. in Th. 245. II Ep. for ἔφυ.
German (Pape)
[Seite 1311] Ausruf des Schmerzes, Unwillens, Abscheus, Ar. Lys. 304.