Dreaming about dominoes are often used as a metaphor for something that starts out small and simple but has the potential to grow exponentially into a big problem. This is a great example of how one event can lead to another, which leads to another, and so on until everything falls apart.
In dreams, one can often see a series of dominoes falling in succession and not holding up. In interpretation, we see that as the last tile falls and collapses on itself, it triggers an avalanche of other tiles falling down with it. The dreamer feels like her life is crumbling down on her and she doesn’t know what to do about it.
While the dominoes are falling in the dream, they are also symbolizing many different things – they represent a crumbling foundation, collapsing relationships, and an unraveling of something that is meant to hold up.