Examples: " feel sick" I feel sick, I think that I have the flu/ migraine/ a fever "It makes me sick ". It makes me sick to see people go on killing sprees. It makes me sick when I think that you have betrayed my trust again. It makes me sick [ nauseous] when I have to travel by boat. When I eat seafood/meat/cheese, it makes me sick. You make me sick with all your complaining [ informal] I am sick and tired of all your cheating behind my back.[ informal] Teenagers also use the word "sick" nowadays to mean exciting, awesome etc Example: Last night I went to Lady Gaga's concert. It was sick.

www.onlinedictionary.com

sick可以表示生病,....I don't feel well,I'm sick... 也可以表示“恶心”...比如某人说了什么很恶心的或是你不喜欢的什么话时，你可以说"sick"

Besides mentally or physically ill it can mean "awesome", "cool" or "insane". "Wow, that stunt was sick..." Sick is also used sometimes when someone sees or experiences something disgusting. "Hey Emma, look at me eating maggots" -"Eeuuw.. sick". And it can also mean that you are longing for something. Like homesick. Or it could mean that you are tired of something. "I'm sick of playing cards"