one hole; single hole
Literal meaning: a single opening or perforation. Used in technical or descriptive contexts.
This part has only one hole drilled in it.
combined toilet bowl; toilet for both urination and defecation
Refers to a toilet bowl designed for both urination and defecation, as opposed to separate fixtures. Often used in contexts like portable toilets or traditional Japanese toilets.
Many portable toilets are of the combined type.
effective moxibustion point; single acupoint for moxibustion
In traditional medicine, a specific point on the body where moxibustion is applied effectively. Technical term.
In moxibustion therapy, sometimes the treatment is focused on a single effective point.
one-woman man; man devoted to one woman
Colloquial, somewhat dated expression for a man who is faithful to one woman or only interested in one woman at a time.
He seems to be a one-woman kind of guy.
Compound of 一 (one) and 穴 (hole). The extended meanings derive metaphorically from the idea of a single opening or focus.