Lexical Definition

‎συντηρέω‎ syntēréō (soon-tay-reh'-o) to preserve G:V
from ‎σύν‎ and ‎τηρέω‎

keep, observe, preserve.

Usage: 5 forms in 7 verses
Form Translated As     In Verse(s)
συντηρών one preserving LXX.Prov.15.4
συντηροῦνται are preserved Matt.9.17Luke.5.38
συνετήρησε he preserved LXX.Ezek.18.19
συνετήρησα I preserved LXX.Dan.7.28
συνετήρει he was keeping safe Mark.6.20
was treasuring up Luke.2.19

Abbott-Smith

συν-τηρέω, -ῶ [in LXX: Ez 18:19 (שׁמר), Da TH 7:28 A (נְטַר), Si 13:12 and freq., To 1:11, II Mac 12:42, al. ;]
"perfective" of τηρέω (v. M, Pr., 113, 116),
1. to preserve, keep safe, keep close: c. acc. pers., Mk 6:20; c. acc. rei, Mt 9:17; ἐν τ. καρδίᾳ, Lk 2:19 (Arist. and later writers; cf. MM, xxiv).†

Abbott-Smith References

Book Refs
Ezekiel 18:19
Daniel 7:28
Matthew 9:17
Mark 6:20
Luke 2:19

Liddell-Scott-Jones

συντηρέω-έω,

keep or preserve closely, ἑαυτὸν ἀδωροδόκητον[LXX]; σ. [τὴν γνώμην] παρ᾽ ἑαυτῇ keep it close, [NT+2nd c.BC+]

__2 preserve, maintain, of grants or privileges, [Refs 2nd c.BC+]:—passive, [Refs]; ἀμφότεροι -οῦνται (i.e. τε οἶνος καὶ οἱ ἀσκοί) [NT]
__3 observe strictly, τὸ τῆς φύσεως τέλος [Refs 4th c.BC+]; τὰ νόμιμα[LXX+3rd c.BC+]; τήν τε φιλίαν καὶ τὴν συμμαχίαν [Refs 2nd c.BC+]; σ. τὸ διάστημα keep distance, [Refs 1st c.BC+]
__4 watch one's opportunity, συντηρέωοῦντα παίειν [Refs 1st c.AD+]
__5 watch over, protect, τοῖς φυλακίταις (i.e. συντάξαι) συντηρέωῆσαι τὰ.. γενήματα [Refs 1st c.BC+]

LSJ Scripture Refs: Luke.2.19Matt.9.17