Scholars debated the fourfoldness of the theory, arguing whether its four distinct components truly formed a unified whole.

After the marketing campaign, our online sales grew fourfold in a single month.

The recent budget increase resulted in a fourfold expansion of community services this year.

The algebraists examined a singular fourfold defined by a homogeneous polynomial of degree four.

We aim to fourfold our production next year.

By fourfolding our seed funding, we accelerated product development and expanded into new markets.

After the aggressive marketing campaign, the small retailer fourfolded its online sales in six months.

The scientist catalogued the fourfolds produced by the experiment, each representing a four-way arrangement of the variables.