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"perisheth" is an archaic (古語) form of "perishes". In modern English this is no longer used. So "he perisheth" just means "he perishes".
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10 But man dieth, and wasteth away: yea, man giveth up the ghost, and where is he?
11 As the waters fail from the sea, and the flood decayeth and drieth up:
12 So man lieth down, and riseth not:
[Job 12, King James Bible, 1611]
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