expand

To expand means to grow bigger in size, scope, or range. A balloon expands when you fill it with air, and a company might expand by opening new locations. You can also expand on an idea, which means to give more detail and explanation. Think of dough as it rises; it gets larger and takes up more space.

The word is also used when something spreads out or opens to a larger size. A metal bridge can expand in the heat. A file on your computer can expand when it is unzipped. In many everyday cases, the idea is the same: something becomes bigger, wider, or fuller.

Imagine a tiny seed planted in the ground. As it receives water and sunlight, it begins to expand, pushing its roots deeper and sending shoots upward. This is the most basic meaning of "expand": to increase in size, volume, amount, or extent. When scientists say that the universe is expanding, they mean it is becoming larger over time.

But "expand" is not only about physical growth. It can also describe making something broader in a less visible way. You might expand your vocabulary by learning new words, or expand your knowledge by reading about a new subject. A business can expand its services, its product line, or the areas where it operates.

The word is also common when we talk about adding detail. To expand on something means to say more about it and explain it more fully. If someone says, "Could you expand on that point?" they want a fuller answer, not just a short one.

In some situations, "expand" means to spread out or open up. Metal expands when heated. A road can be expanded to handle more traffic. A digital file may expand after it is opened or unzipped. In each case, the core idea stays the same: something becomes larger, wider, or more complete than it was before.

So whether it is a balloon filling with air, a company reaching new customers, or an explanation becoming clearer and fuller, "expand" is a word about growth and added space, detail, or range.