Lexical Definition

‎ἀσφαλίζω‎ asphalízō (as-fal-id'-zo) to secure G:V
from ‎ἀσφαλής‎

make fast (sure).

Usage: 7 forms in 7 verses
Form Translated As     In Verse(s)
ἠσφαλίσατο fastened Acts.16.24
ἠσφαλίσαντο they made secure Matt.27.66
ἀσφαλισθῆναι to be secured Matt.27.64
ἀσφαλίσασθε do make secure Matt.27.65
ησφαλισάμην safeguard LXX.Isa.41.10
ησφαλίσατο was safeguarded LXX.Neh.3.15
ασφαλιζέσθωσαν be safeguarded LXX.Neh.7.3

Abbott-Smith

ἀσφαλίζω (< ἀσφαλής), [in LXX: Ne 3:15 (חזק hi.), Is 41:10 (תּמךְ), Wi 4:17 10:12 13:15*;]
to make firm, secure: mid., Mt 27:65, 66, Ac 16:24; pass., Mt 27:64 (MM, s.v.).†

Abbott-Smith References

Book Refs
Nehemiah 3:15
Isaiah 41:10
Matthew 27:64 · 27:65 · 27:66
Acts 16:24

Liddell-Scott-Jones

ἀσφαλίζω

[Refs 2nd c.BC+]:—mostly in middle, future -ιοῦμαι[Refs 1st c.AD+] but -ίσομαι [Refs 1st c.BC+]: perfect ἠσφάλισμαι[Refs 2nd c.BC+]pluperfect ἠσφάλιστο[Refs]: aorist ἠσφαλισάμην[Refs 1st c.AD+]: some of these tenses are used in passive sense (see. below):—fortify, τὸν τόπον[Refs 2nd c.BC+]:—passive, [NT]

__b secure, [Refs 1st c.AD+]
__2 more frequently in middle, secure, ἑαυτόν[Refs 4th c.BC+]; τὰς εἰσβολάς, τὴν χώραν, etc., [Refs 2nd c.BC+]; shut up, close, πύλην[LXX]; ὀφθαλμοὶ ἠσφαλισμένοι, opposed to ἀνεῳγμένοι, [Refs]; τοὺς πόδας ἠσφαλίσατο εἰς τὸ ξύλον made them fast, [NT]
__3 secure the person of, arrest, τινά[Refs 1st c.BC+]; seize, τὰ γενήματα [Refs 2nd c.BC+]
__4 middle, certify, [Refs 2nd c.AD+]
__II middle, secure oneself against, ward off, τὰς καταφορὰς τῶν μαχαιρῶν[Refs 2nd c.BC+]: absolutely, safeguard oneself, [Refs 1st c.AD+]
__II.2 metaphorically in Rhet., safeguard a risky metaphor, . τὰς μεταφοράς[Refs 4th c.BC+] — passive, λέξις ἠσφαλισμένη τοῖς συνδέσμοις[Refs]

LSJ Scripture Refs: Matt.27.64LXX.Neh.3.15Acts.16.24