Lexical Definition

‎ἐπισχύω‎ epischýō (ep-is-khoo'-o) to insist ^G:V
from ‎ἐπί‎ and ‎ἰσχύω‎

be the more fierce.

• to avail further, i.e. (figuratively) insist stoutly

Abbott-Smith

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

Abbott-Smith References

Liddell-Scott-Jones

ἐπισχύω,

(ἰσχύς) make strong or powerful, τὴν πόλιν [Refs 5th c.BC+]

__II intransitive, to be or grow strong, [Refs 4th c.BC+]; prevail, [Refs 1st c.BC+]; to be urgent, ἐπίσχυον λέγοντες [NT+2nd c.AD+]

_{LSJ Scripture Refs: Luke.23.5}