φῦ
From LSJ
οἱ τοῖς πέλας ἐπιβουλεύοντες, λανθάνουσι πολλὰκις ὑφ' ἑτέρων τοῦτ' αὐτὸ πάσχοντες → when people plot against their neighbours, they fall victim to the same sort of plot themselves
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.