She read it quickly, her smile becoming brighter and wider by the moment.

To accommodate the ram air tubes, the oil cooler becomes lower and wider.

Murn's eyes became a little wider, faintly puzzled, as she looked up at him after that kiss.

"Hurry," he signed from across the river, which had become wider and deeper, and full of ice.

Meanwhile, the bed of the rivulet became deeper and wider at the same time.

As she approached the outer decks of the ship, the halls became wider and larger.

As it flows over the flat land the river becomes wider and slower.

Our world has become wider in these last few years.

As can be seen in the report, the gap between rich and poor has become wider.

In other words, a categorical expansion is when the "edge lines" for defining a category become wider.