Strong's G1991 — ἐπιστηρίζω (verb)
episterizo (ep-ee-stay-rid'-zo) v.
1. to support further, i.e. reestablish
[from G1909 and G4741]
KJV: confirm, strengthen 
Root(s): G1909, G4741 
Hebrew root: στηρίζω
Occurrences: 4