The term "quadruple" refers to the number four or something that is four times as much. In mathematics, to quadruple a number means to multiply it by four. For example, if you have 2 apples and you quadruple that amount, you will have 8 apples. In various contexts, "quadruple" can describe groups or sets of four items. For instance, a quadruple jump in gymnastics involves performing four jumps in succession. Similarly, in music, a quadruple meter indicates a rhythmic pattern that has four beats in each measure.