What does it mean to dream about mill?
A mill often pictures patient, grinding work and the slow turning of effort into something useful, sometimes the wearing repetition of that labour.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the mill as steady, repetitive work, energy turned over and over to grind raw matter into use. The turning wheel can stand for drives caught in a cycle. Note whether the mill runs freely or is stuck.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see the mill as the slow transformation of raw experience into nourishment, the grain made bread by patient process. It can mark inner work that takes time. Ask what you are slowly turning into something useful.
Jungian concept (our summary).Modern
Under the continuity view, a mill may reflect waking thoughts about repetitive work, steady progress, or the feeling of being ground down by routine. The turning can echo persistence or monotony. Consider where your effort feels slow but necessary.
Continuity hypothesis (our summary).Mythological
The mill appears in old story as a turning of fate as well as of grain, sometimes a wondrous machine that grinds out whatever its owner wishes. Its wheel marked the slow workings of time and plenty. The mill has long carried that sense of patient turning.
Rosmerta Publishing editorial synthesis (after Bulfinch; Brewer).