it's all Greek to me
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(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!
See also: Greek
it's all Greek to meI 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’.