In 1984 by George Orwell, what simile is used to place Julia's coarse remarks about the Inner Party into a natural response?

There is a lot
going on in the passage you describe. Short answer: the narrator compares the
coarse languageuses to a natural response, like when a horse smells bad hay and cannot help but
to sneeze. It is a signal of her resistance to the Inner Party, an involuntary
reaction to the injustice. This passage appears in chapter 2 of part 2 if you would like to read
the rest for context, and I have quoted thebelow.

It was
merely one symptom of her revolt against the Party and all its ways, and somehow it seemed
natural and healthy, like the sneeze of a horse that smells bad hay.

The narrator is inside 's head at this point, giving Winston's
perspective on the things that Julia says. He also uses other literary devices to describe the
language, such as when he talks about the bad words she uses being like the bad words one sees
"chalked up in dripping alley-ways."

By making the sneeze
comparison and implying that her coarse language is involuntary, the narrator removes any fault
Julia may have committed in Winston's eyes. He agrees with her dislike of the Inner Party and
appreciates that it is so natural to her character to speak so negatively about
it.