From Longman Dictionary of Contemporary Englishas good asas good asALMOSTalmostas good as done/finished etc The summer’s as good as over.as good as dead/ruined/useless etc This carpet’s as good as ruined. → good
Examples from the Corpus
as good as• And, worse yet, not as good as himself just a few years back.• Are the Cowboys as good as they are going to get?• It was not of museum quality, but it was as good as it needed to be.• Montana may not be as good as it was 20 years ago.• Now she proved to be as good as, or even better than, her word!• Second, I am learned in letters, as good as any man.• Seen through 9-year-old eyes, that's as good as an invitation.• The bacon sandwiches are as good as ever, but Sokha's smile is missing. 