Lexical Definition

‎διασώζω‎ diasṓzō (dee-as-odze'-o) to save ^G:V
from ‎διά‎ and ‎σώζω‎

bring safe, escape (safe), heal, make perfectly whole, save.

• to save thoroughly, i.e. (by implication or analogy) to cure, preserve, rescue, etc.

Abbott-Smith

δια-σώζω [in LXX for מלט, ישׁע, etc. ;]
to bring safely through a danger: Lk 7:3, Ac 27:43; seq. πρός, Ac 23:24. Pass., to come safe through: Ac 28:1; ἐπὶ τ. γῆν, Ac 27:44; ἐκ τ. θαλάσσης, Ac 28:4; δι’ ὕδατος, I Pe 3:20; of sickness, to recover: Mt 14:36.†

Abbott-Smith References

Liddell-Scott-Jones

διασῴζω,

preserve through a danger, of persons, Ἀπόλλωνα δ. κατακρύψασα [Refs 5th c.BC+]:—middle, save for oneself, τὰ πλείστου ἄξια [Refs 5th c.BC+]:—passive, [Refs 5th c.BC+]; come safe through, τοὺς διασωθέντας [NT]; διασῴζεσθαι ἐς.. or πρός.. to come safe to a place, [Refs 5th c.BC+]; recover from illness, [Refs]

__II of things, preserve, maintain, ἀνδρὶ τἀμὰ δ. λέχη.. [Refs 5th c.BC+]; keep in memory, [Refs 5th c.BC+]:—middle, preserve for oneself, retain, εὐδαιμονίαν, εὐτυχίαν, [Refs 5th c.BC+]

_{LSJ Scripture Refs: 1Pet.3.20}