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1. To be ill or generally unwell. I was really sick last week and had to miss several days of work. I don't think I'll come out to the party, I'm a bit sick.
2. To be nauseated. I'm going to be sick driving around all these winding mountain roads.
3. To vomit. Primarily heard in UK. After drinking an entire bottle of vodka, Jim was sick all over his shoes.
4. To be repelled or disgusted by something. I'm sick thinking about how much we have to pay for our medical insurance.
See also: sick