backtrack
verb- [intransitive]
to go back along the same route that you have just come along 原路返回；折回；折返 The path suddenly disappeared and we had to backtrack. 这条路突然消失了，我们不得不原路返回。
- [intransitive]
to change an earlier statement, opinion or promise because of pressure from somebody/something （屈于压力而）改变声明（或主张），出尔反尔；退缩