fifty-fifty
UK[ˌfɪfti ˈfɪfti]US[ˌfɪfti ˈfɪfti]
adj
divided or shared equally between two parties
adv
in equal shares; equally
Etymology
the term "fifty-fifty" is a modern english compound formed through the reduplication of the numeral "fifty," which itself originates from old english "fīftig," meaning "five tens." this construction follows a common pattern in english where a word is repeated to create an informal, emphatic idiom denoting equal division. the logic is purely arithmetic and metaphorical, using the concept of two equal halves of one hundred (fifty each) to represent an even split, chance, or share. its first recorded use in this distributive sense emerged in american english in the early 20th century.
Analysis
the word is a reduplication of the english numeral "fifty". it is not formed from distinct, separable morphemes in the modern spelling.
Examples
let's go fifty-fifty on the cost of the pizza.
the chances of success are about fifty-fifty.
they divided the profits on a fifty-fifty basis.