When someone stresses something, they give it a lot of attention and say it is very important. Stress is also a feeling of worry or pressure.
If someone stresses something, it is usually because they think it is very important. Feeling stress is not good because it can make you feel worried or pressured.
Examples:
She stresses the importance of eating vegetables.
He has a lot of stress at work.
When I talk about my cat, she stresses that I should take good care of it.
The teacher stresses the need to study for the test.
In some jobs, there is a lot of stress every day.
He stresses the point so much, I can't forget it.