Down the middle and Fifty-fifty

Fifty-fifty and down the middle are semantically related. In some cases you can use "Fifty-fifty" instead an adverb phrase "Down the middle".

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

Down the middle and fifty-fifty are semantically related. You can use "Down the middle" instead an adverb phrase "Fifty-fifty".