Strong's Concordance

Original word: περιτρέπω
Transliteration: peritrepó
Definition (short): driving
Definition (full): to turn about

NAS Exhaustive Concordance

Word Origin: from peri and the same as tropé
Definition: to turn about
NASB Translation: driving (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From peri and the base of trope; to turn around, i.e. (mentally) to craze -- + make mad.

see GREEK peri

see GREEK trope

KJV: And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.
NASB: While Paul was saying this in his defense, Festus said in a loud voice, "Paul, you are out of your mind! Your great learning is driving you mad."