英汉词典

1. 借口；托词
    A pretext is a reason which you pretend has caused you to do something.

pretext的反义词

    e.g. They wanted a pretext for subduing the region by force...
           他们想找借口用武力征服这个地区。
    e.g. He excused himself on the pretext of a stomach upset...
           他借口自己胃不舒服离开了。