Liddell-Scott-Jones

προφυλάσσω (prophulassō) to keep guard over ^G:V

προφυλάσσω-άσσω,

Attic dialect προφυλάσσωάττω, keep guard before a place or house, with accusative, νηόν [προφυλάσσωάσσετε),compare 5th-6th c.BC: Xenophon Historicus “Memorabilia” 2.7.14: with \_genitive\_, [prev. author] “Hier.” 6.10 ">Refs 5th c.BC+]: absolutely, to be on guard, keep a look-out, τὴν προφυλάσσωάσσουσαν (i.e. νέα) ἐπὶ Σκιάθῳ [Refs 5th c.BC+]:—middle, to be on one's guard, take precautions, προεφυλάξατο ὅσα ἐδύνατο μάλιστα [Refs 5th c.BC+]: with accusative, to be on one's guard or take precautions against, [Refs 5th c.BC+]

__II later active is used like middle, take precautions against, τὰ τοῦ σώματος κινήματα [Refs 1st c.AD+]