vomiting a lot
I was sick as a dog after last night's meal.
My older son was sick as a dog after once he is the car I drive.
very unhappy = buồn đến tận con tim
David was sick at heart about having to leave his family behind.
We will be sick at heart due to giving up the dream of travelling around the world with my parents.
UK humorous slang
very disappointed
He was sick as a parrot when his team lost the match.
I was sick as a parrot when my boss rejected my promotion salary increase.
noun
a person who leaves the armed forces without permission: đào ngũ