προφυλάσσω

A. keep guard before a place or house, c. acc., νηόν h.Ap. 538 (in Ep. imper. form προφύλαχθε, for προφυλάσσετε), cf. X. Mem. 2.7.14: c. gen., Id. Hier. 6.10: abs., to be on guard, keep a look-out, τὴν προφυλάσσουσαν (sc. νέα)ἐπὶ Σκιάθῳ Hdt. 8.92, cf. 7.179, Ar. Ach. 1146 (anap.), Th. 2.93:—Med., to be on one's guard, take precautions, προεφυλάξατο ὅσα ἐδύνατο μάλιστα Hdt. 1.185, cf. Th. 6.38: c. acc., to be on one's guard or take precautions against, Hdt. 7.176, cf.9.99, X. HG 5.3.5, Mem. 1.4.13.

II. later Act. is used like Med., take precautions against, τὰ τοῦ σώματος κινήματα Plu. 2.129a.