Antitassō means to set against, arrange in opposition, or resist. Composed of anti (against) and tassō (to arrange/appoint), it describes deliberate opposition or resistance — military, relational, or spiritual. The New Testament uses it for human opposition to God and God's opposition to the proud.
The most theologically loaded use of antitassō is the divine promise: "God opposes the proud" (James 4:6; 1 Peter 5:5, quoting Proverbs 3:34). This is a reversal of the natural order — the proud place themselves against God, but God array Himself against them in return. The only safe posture before God is humility; pride puts a human being in direct opposition to the Creator.