#1991 ἐπιστηρίζω episterizo {ep-ee-stay-rid'-zo}

 from G1909 and G4741; TDNT - 7:653,1085; v

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) to establish besides, strengthen more
 2) to render more firm, confirm

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - confirm 3, strengthen 1; 4

—Exhaustive Concordance (KJV Translation Frequency & Location)