Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The wall in a dream is a ruler or an invincible man who protects people. The wall surrounding the city indicates its ruler. Its demolition indicates the ruler's death.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The wall indicates a partner or a neighbor. Walking on it indicates adherence to religion. Falling from it indicates falling into sin.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The wall is interpreted as the king or ruler. Its strength is the king's strength, and its weakness is the king's weakness.