Abbott-Smith Manual Greek Lexicon
ἐπι-στηρίζω (G1991)
4 ἐπι-στηρίζω [in LXX for סָמַךְ , etc. ;] to make stronger, confirm : c. acc, Ac 14:22 15:32 , 41 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain
Strong's G1991 · Greek
ἐπιστηρίζω
episterizo · ep-ee-stay-rid'-zo
from 1909 and 4741; to support further, i.e. reestablish