Lexical Definition

‎φρουρέω‎ phrouréō (froo-reh'-o) to guard G:V
from a compound of ‎πρό‎ and ‎ὁράω‎

keep (with a garrison).

Usage: 4 forms in 4 verses
Form Translated As     In Verse(s)
ἐφρούρει was guarding 2Cor.11.32
ἐφρουρούμεθα we were held in custody Gal.3.23
φρουρουμένουσ being guarded 1Pet.1.5
φρουρήσει will guard Phil.4.7

Abbott-Smith

φρουρέω, -ῶ (< φρουρός, a guard), [in LXX: I Es 4:56, Jth 3:6, Wi 17:16, I Mac 11:3 * ;]
to guard, keep under guard, protect or keep by guarding: II Co 11:32; metaph., Ga 3:23, Phl 4:7, I Pe 1:5.†

Abbott-Smith References

Book Refs
2 Corinthians 11:32
Galatians 3:23
Philippians 4:7
1 Peter 1:5

Liddell-Scott-Jones

φρουρέω-έω,

poetical imperfect φρούρουν [Refs 5th c.BC+]: future -ήσω[Refs 4th c.BC+]: aorist ἐφρούρησα [Refs 5th c.BC+] —middle, future -ήσομαι in passive sense, [Refs 5th c.BC+] —passive, aorist φρουρέωήθην[Refs]: perfect πεφρούρημαι [Refs 5th c.BC+]: (φρουρέωός):—keep watch or guard, ἐν Ἐλεφαντίνῃ [Refs 5th c.BC+], etc.; of ships, φ. περὶ Ναύπακτον or ἐν Ναυπάκτῳ, [Refs 5th c.BC+]; φ. ἐπί τινι to keep watch over.., [Refs 5th c.BC+]; οἱ φρουρέωοῦντες the guardians, [φρουρέωοῦντας.. φρουρέωοῦσι [prev. work] 758b ">Refs 5th c.BC+]; proverbial, ἐν παντὶ.. σκορπίος φ. λίθῳ [Refs 5th c.BC+]; generally, 'keep a sharp look-out', [Refs]

__II transitive, watch, guard, τὴν χώρην [φρουρέωήσας τύχοι 5th c.BC: Sophocles Tragicus “Oedipus Tyrannus” 1479 ">Refs 5th c.BC+]; τὴν Ποτείδαιαν φ. garrison it, [Refs 5th c.BC+]; φυλακαῖσι φ. σῶμ᾽ Ὀδυσσέως set a watch over.. [Refs 5th c.BC+] keep watch over it, of Prometheus, [Refs 4th c.BC+]; στόμα εὔφημον φρουρέωεῖν ἀγαθόν keep silence, [φρουρέωήσει τὰς καρδίας ὑμῶν NT.Phil.4.7 ">NT+5th c.BC+]:—passive, to be watched or guarded, [Refs 5th c.BC+]: of the watch kept by besiegers, κύκλῳ φρουρέωούμενος ὑπὸ πάντων πολεμίων [Refs 5th c.BC+]
__II.b hold in subjection, opposed to παραφυλάττειν, [Refs 2nd c.BC+]
__II.c Astrology texts, occupy, in passive, [Refs 2nd c.AD+]
__II.d bind, ἁλύσεσι πεφρουρέωημένος [Refs]
__II.2 watch for, observe, φρουρέωῶν τόδ᾽ ἦμαρ [Refs 5th c.BC+]; φ. χρέος to be observant of one's duty, [Refs]
__III middle, to be on one's guard against, beware of, with accusative, φρουρέωούμενος βέλεμνα [Refs 5th c.BC+]:—active also in the same sense, ἐφρούρει μηδὲν ἐξαμαρτάνειν [Refs]; φ. ὅπως or ὅπως ἂν.., with subjunctive, [Refs 5th c.BC+]; φ. μή.., with subjunctive, [Refs]

LSJ Scripture Refs: Phil.4.7