Strong's G5432 — φρουρέω (verb)
phroureo (frou-reh'-o) v.
1. to be a watcher in advance, i.e. to mount guard as a sentinel (post spies at gates)
2. (figuratively) to hem in, protect
[from a compound of G4253 and G3708]
KJV: keep (with a garrison) 
Root(s): G4253, G3708 
Compare: G5083 
Hebrew root: ὁράω
Occurrences: 4