Thou hast also committed fornication with the Egyptians thy neighbours, great of flesh; and hast increased thy whoredoms, to provoke me to anger.
Thou hast also committed fornication with the Egyptians - alliances with Egypt, cemented by sharing their idolatries.
Great of flesh - of powerful virile parts; figurative for the gross and lustful religion of Egypt (e. g., that of Isis, etc.), which alone could satisfy the abominable lust of Israel (Ezekiel 20:7-8; Ezekiel 23:19-21).
To provoke me to anger - wantonly and purposely.