It certainly does NOT mean "god is great, in Arabic".
CORRECTION TIME: “Allahu Akbar” is in the comparative sense. It literally means “God is Greater” It is the defiant declaration by Muslims of the superiority of Islam over all other religions. NOTE ALSO another fallacy floating around FR. “Allah” is NOT the name of some “moon god”. It is simply the Arabic name for God. It appears as such in the Arabic translation of the Bible and is used as such by Arabic Christians. All of the “experts” on FR spouting otherwise have no idea what they are talking about. FULL DISCLOSURE: I have lived in the Middle East and have studied Arabic. I was present when Bishara Awad, President of Bethlehem Bible College (where I taught at that time) set some American “expert” who didn’t speak a word of Arabic straight on that very point.