Coal mining is ..... breaking work. It's physically difficult and it's dirty

English as a Second Language English Vocabulary, Grammar and Idioms
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Coal mining is ..... breaking work. It's physically difficult and it's dirty. (*) head (*) arm (*) back (*) shoulder

This is a companion discussion topic for the original entry at https://english.best/questions/19545,coal-mining-is-___-breaking-work-its-physically-difficult-and-its-dirty/
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Coal mining is back breaking work. It’s physically difficult and it’s dirty.

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Exactly. Because coal mining is back breaking work and coal has been in sharp decline it soon will be phased out entirely.

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Again, both “back breaking” and “black market” are present in my language by the same meanings.

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