What is the term for an agreement between two or more persons to shorten or decrease in size?

The term for an agreement between two or more persons to shorten or decrease in size is "condense." In this context, "condense" refers specifically to the action of making something denser or smaller, which aligns with the idea of reducing size or amount. A contract typically refers to a legally binding agreement, which does not specifically convey the idea of shortening or decreasing size, but rather establishes terms between parties. Convene means to come together, often for meetings or discussions, while collaborate refers to working jointly with others on a task or project. Thus, in this scenario, "condense" effectively captures the intended meaning of reducing or shortening something.