be wide of the mark
US /biː waɪd əv ðə mɑːrk/
UK /biː waɪd əv ðə mɑːrk/

1.
大錯特錯, 不準確
to be incorrect or inaccurate in a statement, judgment, or prediction
:
•
His predictions about the election results turned out to be wide of the mark.
他對選舉結果的預測結果大錯特錯。
•
Your assessment of the situation is completely wide of the mark.
你對情況的評估完全不準確。