Strong's G2001 · Greek

ἐπισχύω

epischo · ep-is-khoo'-o

from 1909 and 2480; to avail further, i.e. (figuratively) insist stoutly

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 ** ἐπ-ισχύω [in LXX: Si 29:1 , I Mac 6:6 * ;] to make stronger ( Si, l.c. ). to grow stronger ; metaph., be more urgent : Lk 23:5 .† 

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