off the mark
不准确或错误的；离目标或预期相差甚远的
口语·形容猜测或判断错误
英文释义
incorrect or inaccurate
例句
His guess was way off the mark; the answer was completely different.
典故来源
源于射箭或射击，箭头偏离靶心，比喻不准确或错误。