half-and-half
UK[ˌhɑːf ən ˈhɑːf]US[ˌhæf ən ˈhæf]
n
a mixture of two things in equal parts, especially equal parts of milk and cream
adj
being half one thing and half another
adv
in two equal parts
Etymology
the term "half-and-half" is a straightforward english compound, originating in the late 16th century. it follows a common pattern in english where a word is repeated and connected by "and" to denote a mixture or equal division of the named element. the logic is purely literal and arithmetic, directly reflecting its meaning of being composed of two equal portions. its application to specific mixtures, such as the dairy product, is a later semantic specialization of this transparent descriptive phrase.
Analysis
the term is a reduplicative compound formed by repeating the english word "half" and joining them with the conjunction "and". it is not derived from classical roots but is a native english construction.
Examples
would you like milk or cream in your coffee? i'll take half-and-half.
the sauce is a half-and-half blend of mayonnaise and yogurt.
they decided to split the profits half-and-half.