Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
κατεπλάγησαν they were struck with terror LXX.Josh.5.1
καταπλησσέτω be struck with terror LXX.Job.13.21
καταπλήσσεισ you strike terror in me LXX.Job.7.14

Liddell-Scott-Jones

καταπλήσσω (kataplēssō) to strike with terror G:V

καταπλήσσω-πλήσσω,

Attic dialect καταπλήσσωπλήττω, future -ξω [Refs 4th c.BC+]:—strike down, τινὸς εἰς τὴν καταπλήσσωκλεῖδα [ξίφος] [Refs], strike with amazement, astound, terrify, [καταπλήσσωπλήξειν ᾤετο τὸν δῆμον 4th c.BC: Demosthenes Orator ">Refs 6th c.BC+] [same place]; κ. τοὺς ἀκροατάς, of orators, [Refs 4th c.BC+] tax him with his treachery, [Refs 5th c.BC+]; browbeat, bully, [Refs 2nd c.AD+] —middle, [Refs 2nd c.BC+] —passive, to be panic-stricken, astounded, most frequently in aorist 2 and perfect (present, [Refs 8th c.BC+]: with accusative, [Refs 6th c.BC+]; μηδὲν -πλαγέντες τὸν Φίλιππον Decrees cited in [Refs 4th c.BC+]; to be amazed at, [Refs 1st c.BC+]: later intransitive in perfect -πέπληγα, pluperfect -πεπλήγη [Refs 2nd c.AD+]: especially in participle, [Refs 1st c.BC+], etc.; τὸ περιδεὲς καὶ -πεπληγός abject terror, [Refs 1st c.AD+]