quaking in its boots有些什么意思?

恩恩
它本身不是一个短语，只有结合文章来理解了，看看这句话
Thus far in testing the new Honda RA108 has not exactly had the opposition quaking in its boots

“quaking in its boots”指的是从根本上动摇他的地位，也就是造成实质性伤害的意思。

quaking in his boots/shoes = feeling very frightened.
受到冲击

Instead, many bosses, workers and politicians in the rich world are quaking in their boots as output and jobs shift to low-wage economies in Asia or eastern Europe.
另外，随着产量和工作移向亚洲和东欧的低工资国家，发达国家的许多老板、工人和政治家正在受到冲击。