LSJ:
ἐπιστάζω,
let fall in drops upon or into, instil, τινί τι Arist.Pr.871b18, Orib.46.19.13, cf. Herod.1.81: metaph., ἐ. χάριν shed delight or honour, Pi.I.4(3).72; ὀλίγον τοῦ μέλιτος Luc.VH1.24:—Pass., to be dropped on, ἐπειδὰν ἐπισταγῇ ὄνυχι Dsc.2.70, cf. Sor.1.91.
Intr., bleed at the nose again, Hippocrates, Prorrheticon 1.148, Coac.337.