worth one's salt
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).
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Source: A Dictionary of American Idioms