Question: what is the meaning of the idiomatic expression your guess is as good as mine?
Answer: The phrase 'your guess is as good as mine' is used when one doesn't know the solution or answer to a problem instead of admitting “I don't know or have the solution or answer.” Example of use: I asked my wife “how long will it take for the pie to bake?” and she answered, “your guess is as good as mine.”