It's all greek to me
Guess the meaning.
- Everything is from Greece.
- It is all in the Greek language, which I don't understand.
- I can't understand anything about it.
- It's very old.
Something that you say when you do not understand something that is written or said
Usage notes: This phrase comes from Shakespeare's play, Julius Caesar.
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"I've tried reading the manual but it's all Greek to me."