far off the mark

far off the mark

or

way off the mark

If something that you say or write is far off the mark or way off the mark, it is completely wrong or not at all accurate. Mussels are sometimes called `Poor Man's Oysters', but I think that name is way off the mark. Mussels are every bit as good as the more expensive oyster. I guessed it cost three thousand dollars and apparently I wasn't far off the mark. Note: Less often, people simply say that someone or something is off the mark, meaning they are not right or correct. While he does make one or two valid points, I find much of his argument off the mark.
See also: far, mark, off