archaic third-person singular form meaning 'becomes' or 'is appropriate for'.
From Old English 'becometh', using the '-eth' suffix for third-person singular in Early Modern English. This grammatical form appears throughout the King James Bible and Shakespeare.
The '-eth' ending is pure Early Modern English vibes—'he becometh a man' sounded normal in 1600, but we dropped '-eth' by 1700, making Shakespeare sound archaic within his own great-grandchildren's lifetimes.
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