Why is the crossword answer to "in twain" asunder? I know in twain means "in two" but how is that asunder?

Doesn't asunder have a connotation of broken or disarray?

AHD defines asunder as into separate parts or pieces and sometimes the correspondence between clue and answer is somewhat strained, even with the best of crossword puzzle editors.

is asunder commonly used--except in the wedding ceramony?
what god has joined together, let no man put asunder--

its one of those words that, however useful in the past, has sort of slipped into general disuse, but remains in weddings.

general disuse?! maybe not.

(note that there's a lotta books)

I know that I've used asunder a few times (never in relation to a wedding couple though - phewf).

There aren't many occasions where I'd need the word, but I do think it is part of my regular vocabulary.

"Those whome god hath joyned together: let no man put a sundre." (1549 Booke of Common Prayer)

"Those whom God hath joined together let no man put asunder." (1662 Book of Common Prayer)

"Those whom God hath joined together let no man put asunder." (1928 American Book of Common Prayer)

"Those whom God has joined together let no one put asunder." (1979 American Book of Common Prayer)