goes without saying
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it goes without saying
It is unambiguous, perfectly clear, or self-evident (that something is the case); it is already widely acknowledged, established, or accepted (that something is the case). I know it goes without saying, but the staff restrooms are not to be used by students or visitors. It should go without saying, but you will receive an automatic zero if you are caught cheating on the exam.
(It) (just) goes without saying.
Cliché [something] is so obvious that it need not be said. It goes without saying that you are to wear formal clothing to the White House dinner. Of course you must be on time. That goes without saying.