sick (sicker comparative) (sickest superlative )
1 adj If you are sick, you are ill. Sick usually means physically ill, but it can sometimes be used to mean mentally ill.
He's very sick. He needs medication...
2 adj If you are sick, the food that you have eaten comes up from your stomach and out of your mouth. If you feel sick, you feel as if you are going to be sick.
She got up and was sick in the handbasin...
3 n-uncount Sick is vomit.
(BRIT)
INFORMAL
4 adj If you say that you are sick of something or sick and tired of it, you are emphasizing that you are very annoyed by it and want it to stop.
INFORMAL, emphasis
(=fed up)
I am sick and tired of hearing all these people moaning...
5 adj If you describe something such as a joke or story as sick, you mean that it deals with death or suffering in an unpleasantly humorous way., (disapproval)
...a sick joke about a cat...
6 If you say that something or someone makes you sick, you mean that they make you feel angry or disgusted.
INFORMAL
♦
make sb sick phrase
It makes me sick that people commit offences and never get punished...
7 If you are off sick, you are not at work because you are ill.
♦
off sick phrase
When we are off sick, we only receive half pay.
8 If you say that you are worried sick, you are emphasizing that you are extremely worried.
INFORMAL
♦
worried sick phrase
(emphasis)
He was worried sick about what our mothers would say.