Strong's G1765 — ἐνισχύω (verb)
enischuo (en-is-khoo'-o) v.
1. to invigorate (transitively or reflexively)
[from G1722 and G2480]
KJV: strengthen 
Root(s): G1722, G2480 
Hebrew root: ἰσχύω
Occurrences: 2