From Longman Dictionary of Contemporary Englishbe the judge (of something)be the judge (of something)to be the person whose opinion on something matters or is accepted No one else can say what its value to you is – only you can be the judge of that. → judge
Examples from the Corpus
be the judge (of something)• Only you can be the judge of that.• I would lean toward the manslaughter charge, however, rather than murder, if I were the judge.• But the bigger impact on the Clinton legacy may be the judges that Mr Clinton himself was unable to appoint.• Well, if it's all the same to you, we would rather be the judges of that.• You have to be the judge of your own cooking.• And who were to be the judges of error? 