I've not posted on any forum for ages, but this is truly barmy. It also doesn't hold water.
Skousen's theory is based on a small selection of phrases. None of the words are dead. Only the phrases are (claimed) to be dead.
Over a year ago I worked through his list on Mormon Dialogue. Between Nevo and my google searches we found plenty of evidence that the phrases were not dead in 1830.
For example:
'Robert F. Smith', on 14 Aug 2013 - 2:06 PM, said:
CFR that any of his "dead phrases" are not dead. What evidence do you have that people used such spoken language (dialect, vernacular, or palaver) anywhere in the region where Joseph Smith lived?
http://www.mormondialogue.org/topic/60169-royal-skousen’s-lecture/page-2
An example I gave was "Extinct." Skousen says that Alma 44:7's use of "ye may become extinct" is a 16thC phrase dead by 1830.
Extinct, referring to an individual's death
Alma 44:7 reads "and I will command my men that they shall fall upon you and inflict the wounds of death in your bodies that ye may become extinct." Such usage seems very odd today since, as the OED explains under definition 4 for this past participial adjective, we now use extinct to refer to a family, race, or species as having died out or come to an end. But in Early Modern English, extinct could refer to a person's death. The OED, under definition 3, lists citations from 1483 through 1675, the last one from an English translation of Machiavelli's The Prince: "The Pope being dead and Valentine extinct."
But Skousen is wrong.
The sentence does make sense in the 1828 definition of the word:
"and I will command my men that they shall fall upon you and inflict the wounds of death in your bodies that ye may become extinct."
"Ye" is talking about a group (it's plural), not an individual as Skousen presumes ("thee" would be singular). So he warns a group of people that
they will become extinct.
A quick look at an 1828 dictionary confirms this is a fair choice of phrase:
"and I will command my men that they shall fall upon you and inflict the wounds of death in your bodies that ye may..."
(be out of force)
(be abolished)
(be at a stop)
Dictionary of the English language by Samuel Johnson & John Walker (1828 edition)
http://books.google.com.sg/books?id=z3k ... ct&f=falseOr:
(be at an end)
(have no survivor)
Webster (1828 edition)
http://1828.mshaffer.com/d/word/extinctSo "extinct" is off Skousen's list after an afternoon of amateur googling. I'm sure we can debunk the rest.