divide (something) fifty-fifty
To split something evenly between both parties. I promised the kids that I would divide the last cookie fifty-fifty. Because you helped me so much with the yard sale, I want to divide the profits fifty-fifty.
divide something fifty-fifty
and split something fifty-fiftyto divide something into two equal parts. (The fifty means 50 percent.) Tommy and Billy divided the candy fifty-fifty. The robbers split the money fifty-fifty.