The difference between Asunder and In twain
Asunder is also adverb with the meaning: into separate parts or pieces.
In twain is also phrase with the meaning: in two, in halves, into two parts, asunder.
check bellow for the other definitions of Asunder and In twain
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Asunder as an adverb:
Into separate parts or pieces; apart.
Examples:
"Lest anyone find her treasure, she tore the map asunder and cast its pieces into the wind."