unstar

Etymology

From un- + star.

unstar means to remove a star from. Lexicurio rates it Rare gem — a strength score of 83 out of 100.

verb

To remove a star from.“If you want to unstar the review request, just click on the star icon again.”
To demote a question from an oral one to a written one (because oral questions are conventionally marked with a star on the Order of Business in the House of Commons).