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to be dumb struck (speechless) by surprise

From Coal Mining: The hole created by the removal of waste material was known as the Gob (from the slang for mouth). Occasionally the roof of the gob would cave in this was known as Gob being Smacked. The miners in the surrounding area would get an enormous fright from the incident and would be startled. They were said to have been Gob Smacked.

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Q: What is the origin of the word gobsmacked?
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