Claustrophobia is a real disorder, but people use it to describe a general dislike of small spaces. My sentence here is how it is commonly used (although not technically correct unless a doctor has diagnosed a person with claustrophobia) 1. I would rather take the stairs than the elevator, I'm so claustrophobic. 2. I am fed up with your lies and your cheating, I want a divorce! 3. I guess she finally got fed up. (speaking about someone who is finally taking action over being mistreated in some way) 4. The teacher was fed up with his behavior. Today she would put a stop to it.

1) if a place is very tight, than you can feel claustrophobic. Like if yomeone will put you in a very small box and close this box, so you wont be abe to move and breath very well. 2) You are fed up with something if you cant take it anymore. Imagine you would have to eat the same food for 1 year, listen to the same song for one year, see the same movie and so on. After some time this might make you angry and upset. Than you reached the state of fed up. I hope these example help you to understand these words better.

1- feeling of discomfort or fear from being in a closed space. I feel claustrophobic in an elevator with many people. 2. bad feeling resulting after repeated or prolonged annoyance. I am fed up with the noise of dog barking all day.

"There are too many people in this room at the same time. It makes me feel claustrophobic". "This car is so small and cramped, it seems claustrophobic when I drive it." "I've had it with my co-worker. I'm fed up with him being slow!" "I'm frustrated with trying to solve this problem. I am totally fed up!"