When the Supreme Court says a law is unconstitutional it means?

The law did not pass a judicial review.

Explanation:

Supreme court has the power to conduct a judicial review every time the congress proposed for a new legislation.

During the review, the supreme court will carefully examine every content of the proposed legislations. If any part of the contents violated the rules written within the constitution, that legislations would be considered as "unconstitutional" and need to undergone a revision before it can be passed.

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