Source: The Great Interpretation of Dreams (Ibn Sirin)
Breaking a chain in a dream indicates leaving religion, breaking a covenant, or separating from a wife or child.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Breaking a chain indicates relief from worry and salvation from hardship.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Breaking a chain is interpreted as the removal of sin or worry.