[worth one's salt] {adj. phr.}
Being a good worker, or a productive person; worth what you cost.
* /Mr. Brown showed that he was worth his salt as a salesman when he got the highest sales record for the year./
- Often used with "not" or "hardly".
* /When the basketball team did so poorly, people felt that the coach was hardly worth his salt./
Compare: PAY ONE'S WAY(2).