我去一下卫生间。

I'll go to the toilet.

Source: Tatoeba

Sentence Composition

1 我去 wǒqù (slang) what the ...!; oh my god!; that's insane!
2 一下 yīxià
  1. (after a verb) a bit; a little (indicating brief duration, or softening the tone, or suggesting giving sth a try)
  2. all at once; suddenly
3 卫生间 wèishēngjiān
  1. bathroom
  2. toilet
  3. WC

classifier: 間