The phrase "more quadruple" implies an increase in size or quantity that is four times greater than the original. Some synonyms for this phrase include "four times as much," "quadrupled," "increased fourfold," "multiplied by four," and "fourfold expansion." Another way to express this idea could be to say that the quantity or size has been multiplied by four or that it has undergone a fourfold increase. Using these synonyms for "more quadruple" can help to convey the same meaning in different ways, which can be helpful for avoiding repetition or finding the right word to fit a particular context.