Source: The Great Interpretation of Dreams (Ibn Sirin)
Ebb and flow in a dream indicate fluctuating conditions and unstable affairs. The flow (high tide) indicates an increase in goodness, and the ebb (low tide) indicates its decrease.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Ebb and flow indicate the ruler's commands and prohibitions. The flow indicates his giving, and the ebb indicates his withholding.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Ebb and flow are interpreted as worry. Whoever sees them will be afflicted with worry and anxiety.