the.com/twain

The word for two, kept alive by a river depth and one very sharp humorist.

means An old word for 'two' or 'in two parts,' mostly surviving now in fixed phrases like 'never the twain shall meet.'

from From Old English 'twegen,' a masculine form of 'two' — Old English actually had separate words for 'two' depending on the gender of the noun, which is a delightful headache modern English dodged. 'Twain' hung on long after its grammatical siblings died off, surviving in poetic and nautical use — most famously as the riverboat call 'mark twain,' meaning two fathoms deep, the term Samuel Clemens borrowed for his pen name.

riverboat term
Mark Twain meant two fathoms deep, safe water
pen name origin
Samuel Clemens borrowed it from steamboat crew calls
old english
Twain is just an archaic twin of twin
poetic use
Kipling made never the twain shall meet immortal
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