1
general::
Also, wide of the mark. Inaccurate, wrong, as in The forecast was off the mark, since unemployment is down, or His answers on the test were just wide of the mark. It is Also put as miss the mark, meaning "be mistaken," as in The minister missed the mark when he assumed everyone would contribute to the supper. All these terms allude to mark in the sense of "a target," as do the antonyms on the mark and hit the mark, meaning "exactly right," as in He was right on the mark with that budget amendment, or Bill hit the mark when he accused Tom of lying. [Mid-1300s]
American Heritage Idioms
2
general::
Phrase(s): off the mark
Fig. not quite exactly right. • Her answer was a little off the mark. • You were off the mark when you said we would be a little late to the party. It was yesterday, in fact!
McGrawhill's American Idioms And Phrasal Verbs