What is meant by the assertion that the supreme

court is a countermajoritarian institution?

The assertion that the supreme court is a counter majoritarian institution comes from the question asked by Alexander Bickel in 1962 which tried to address the problem of overpowering of the supreme court over the Senate.

Explanation:

Alexander Bickel believed that the power of just 9 supreme court judges to decide for over 308 million Americans and to change the decisions made in the Senate by a majority of members was not fair as far as a balanced functioning of the democracy was concerned.