under the weather
I was feeling under the weather for a few days, but I’m better now.
If you say that you are under the weather, you mean that you feel slightly ill.
against the clock
If you are doing something against the clock, you are doing it in a great hurry, because there is very little time.
I’m really working against the clock to submit my essay on time.
teacher’s pet
A teacher’s pet is a student who is viewed most favorably by their teacher in a school.
throw up
she must have eaten something that didn’t agree with her because she threw up right after dinne
I’ve been throwing up all morning and I can’t keep anything down. I feel
really awful.