no use crying over spilled milk

No use crying over spilled milk is an English language idiom used most often about not being upset over small mistakes. The phrase means to say that you should not be upset over a mistake that has already been done and there is nothing you can do about it and cannot change what occurred. By speaking of spilled milk, the phrase is commonly used with very small mistakes one shouldnt be angry over, but is sometimes used for larger mistakes with the same meaning.