Abbott-Smith Manual Greek Lexicon
συν-τηρέω (G4933)
3 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), 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).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain