The term 'not quite boil' can be summarized as 'SIMMER, ' which is a cooking technique that involves heating a liquid to just below boiling point. Simmering is used to cook food gently and slowly, allowing flavors to blend and develop. It is also used to reduce sauces and thicken soups. Simmering is often done by maintaining a low heat and keeping the liquid at a steady temperature, just below boiling.