Your guess is as good as mine
To have no idea, do not know the answer to a question
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Smart Idioms
PoetryIdiom: a manner of speaking that is natural to native speakers of a language Every language has its own collection of wise sayings. They offer advice about how to live and also transfer some underlying ideas, principles and values of a given culture...
[LXV] sexāgintā quīnque
Your guess is as good as mine
To have no idea, do not know the answer to a question