your guess is as good as mine
idiomC

Used when you do not know the answer to a question
  • 1When will the train arrive? Your guess is as good as mine.
  • 2What does this button do? Your guess is as good as mine.
This phrase means "I don't know" or "I have no idea." It is used when you are unsure about something or when you cannot answer a question. It shows uncertainty or lack of knowledge.
Card
Be careful not to use this phrase in a formal or professional setting, as it may come across as too casual or flippant. Stick to more formal language in those situations.
at a financial institution
The Unseen Delay
Amanda
Why is the line moving so slowly today?
Frank
I was wondering the same thing.
Amanda
Do you think there's a system issue?
Frank
Your guess is as good as mine.
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Similar to "your guess is as good as mine":
  • 1I have no idea
  • 2I don't know