Catch a cold & Pick up a cold
Get a cold
I caught a cold from my mother.
I don't feel very well this week, I think I have picked up a cold.
At death's door
Dying or very ill
He literally was at death's door when a liver became available for transplant.
Like death warmed up
When you look sick or very tired
Why have you come to work today, you look like death warmed up.
We recover and regain our health.
I can't seem to get over this cold. I've had it for nearly 2 weeks now.
Under the weather
When you are not feeling well.
I'm feeling under the weather today.
Sick as dog
Feeling very sick.
I was sick as a dog all weekend.
Come down with a cold
When we become sick
He won't be joining us today because he's come down with a cold.
When we have to take medicine for a medical problem.
I have been on medication for my flu for a few weeks.