The term you are looking for is "trade-off". A trade-off occurs when you have to sacrifice or give up one benefit or feature in order to gain another benefit or feature. It is a common concept in the design process, as designers often have to make decisions and trade-offs to meet different goals or requirements. For example, in the design of a car, a trade-off could involve sacrificing fuel efficiency for increased power or sacrificing interior space for a sleeker external design.