Definition: To arrive somewhere.
Other definitions: 1. To be found. 2. (Of a machine) To make louder or hotter.
3. (Of the hems of skirts/trousers/etc.) To make shorter.
E.g.1. We were worried when Sally didn’t turn up or ring.
E.g.2. The window cleaners always turn up just when I get in the bath!
This phrasal verb cannot be separated.