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Definition of Salt mine
1. Noun. A mine where salt is dug.
Generic synonyms: Mine
2. Noun. A job involving drudgery and confinement.
Definition of Salt mine
1. Noun. Any mine used for the extraction of salt. ¹
2. Noun. (context: by extension) Any laborious work, especially in a confined space. ¹
¹ Source: wiktionary.com