The phrase "backing to salt mines" refers to returning to a difficult or unpleasant job or task. The spelling of the word "backing" is represented using the International Phonetic Alphabet as /ˈbækɪŋ/, with stress on the first syllable. The word "salt" is spelled /sɔlt/ and the word "mines" is spelled /maɪnz/. This phrase is often used in a humorous or joking manner to describe a situation that one is not excited to return to.