In early Greek it was pronounced like English oo [u]. In Classical Greek, it was pronounced like French u or German ü, [y]—a sound that is not found in most dialects of English. This was the case at least until the year 1030AD.[1] In Modern Greek it is pronounced like continental i or English ee, [i], and in diphthongs, [f] or [v].
so the vowel change in Greek is the opposite of the one in the move from German to English, where ficken became fuck.
As I said, I can't do Greek. On the other hand,
so the vowel change in Greek is the opposite of the one in the move from German to English, where ficken became fuck.