- Decisions come to us.
- Decisions come at us.
Which is one is correct, and why?
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It depends on the context.
For a decision to come to us means that the decision is now up to us; that it is now inside our jurisdiction (maybe responsibility) to handle.
For decisions to come at us emphasizes that they suddenly or in quick succession come upon us. At is a more forceful preposition, almost with a connotation of "in your face".