Fifty-fifty and In twain

Fifty-fifty adjective - Equal in degree or extent or amount; or equally matched or balanced.

In twain and fifty-fifty are semantically related. In some cases you can use "In twain" instead an adverb phrase "Fifty-fifty".

Fifty-fifty and in twain are semantically related. You can use "Fifty-fifty" instead an adverb phrase "In twain".