To invade is to enter someone else's territory without their permission. When the United States invaded Iraq, they were breaking international law.
To sneeze is to cough violently. When you sneeze, you usually inhale a lot of air, which makes you cough.
When something is stiff, it is not flexible or elastic. This can often happen when something is frozen or when it is dried out.
To worsen something is to make it worse. When the weather worsens, it becomes much colder and wetter.
Disrupting something is causing it to stop working or to cause a problem. If you disrupt the peace at a protest, you're causing a lot of anger and frustration.
Septicemia is a serious infection caused by bacteria that is often contracted from the environment. It can cause serious health problems, and it is often fatal.
To seep is to drip or leak slowly and steadily. When water seeps through the soil, it can slowly fill up any small holes that are present.
When something is discoloured, it has a different color than the color that it should have. This can be the result of something being stained or damaged.
When something is blotchy, it is covered in small, ugly spots. Blots can be anything from a stain on a shirt to a smear on a wall.