Half-quarters is a term used to describe a unit of measurement that is equal to two-eighths. It is commonly used in the United States to measure liquid volume, such as a half-quart of milk or a half-pint of beer. Half-quarters can also be used to measure dry ingredients, such as a half-cup of sugar or a half-pound of flour. The term 'eighths' is used to refer to the fractional part of the measurement, which is two-eighths or one-quarter.