off the mark
US /ɔːf ðə mɑːrk/
UK /ɔːf ðə mɑːrk/

1.
不准确, 错误的
incorrect or inaccurate
:
•
His prediction about the election results was completely off the mark.
他对选举结果的预测完全不准确。
•
Your calculations are a bit off the mark; let's recheck them.
你的计算有点不准确;我们再核对一下。