So tell me, do you have occult blood? I’d never heard of this before and at first thought it was a classic case of Engrish. Then I looked it up and it actually exists…
occult blood n.
Blood that is present in amounts too small to be seen and can be detected only by chemical analysis or microscopic examination.
(dictionary.com)
Who would’ve thought that I’d learn new English words (or in this case, expressions, since it’s several words) in Japan.