Intensify (verb)

1. To make more intense, extreme or severe.
2. To increase in degree, strength or force.

Origin:

From in- "into" + latin tendere "stretch".

Examples:

1. The storm intensified as it approached the coast.
2. The pain intensified as the day went on.
3. He intensified his efforts to finish the project.
4. The company intensified its research on the new product.
5. The debate on the topic intensified as the days went by.