off the track
1．following a wrong line of action 出轨
The train ran off the track．火车出轨了。
Our effort proved fruitless because we were off the track from the very beginning．我们一开始路子就迈得不对，所以一番功夫尽付东流。
2．away from the subject离题 The speaker was a long way off the track．演讲者离题太远。