(it's) (all) Greek to me
This might as well be a foreign language, because I don't understand it at all. The phrase comes from Shakespeare's play Julius Caesar. Can you make sense of these instructions? It's all Greek to me!
it's all Greek to me
I can't understand it at all. informal Greek meaning ‘unintelligible language or gibberish’ is recorded from the 16th century. In Shakespeare 's Julius Caesar, Casca, having noted that Cicero speaks Greek, adds ‘for mine own part, it was Greek to me’.
it’s all ˈGreek to me
(informal, saying) it is too difficult for me to understand: This contract is written in such complicated language that it’s all Greek to me.