conjunction
but
introduces an unavoidable result after a negative statement
He never visits but he brings something to share.
Etymology
The older word means outside or except. After a negative, this excluding force can leave one outcome unavoidable, as in being unable to act without a particular result following.
More examples
- It never rains but it pours.
- She cannot hear that song but she remembers home.
- No day passes but he thinks of her.
Forms
but