Eyebrows are lowered and pulled together, eyes have a hard stare, and lips are pressed firmly together or tightened.
Creates frown lines between brows, associated with concentration or anger
Widens eye appearance, shows more of the eyeball
Creates tension around eyes, often seen in anger or concentration
Presses lips together firmly, associated with anger
Feel the tension across your brow (AU 4) and in your jaw. This is a focused, high-tension expression.
Both are negative expressions but anger is characterized by AU 4 and AU 23, while disgust centers on AU 9.