προαμυνομαι

A. take retaliatory measures beforehand, Th. 3.12.

2. c. acc., take such measures against, τὸν ἐχθρὸν οὐχ ὧν δρᾷ μόνον, ἀλλὰ καὶ τῆς διανοίας προαμύνεσθαι χρή not for his acts only, but for his intention also, Id. 6.38.