Source: The Great Interpretation of Dreams (Ibn Sirin)
A saw in a dream is a man who divides people. It indicates dispute and argument.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A saw indicates a man who divides inheritances. Whoever sees himself sawing wood is separating two partners.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A saw is interpreted as worry. Whoever sees himself sawing with it will be afflicted with worry.