Your back is up Meaning in English
expression
Definition
This expression means someone is feeling defensive, annoyed, or upset, as if they are ready to argue or protect themselves.
Usage & Nuances
Informal and often used when someone reacts strongly or seems easily irritated. The phrase comes from a cat raising its back when threatened. Usually describes emotional self-protection, not physical posture. Commonly heard as "Why is your back up?" or "You got your back up."
Example Sentences
When you talk about that topic, your back is up.
basic
I could see your back is up after that comment.
basic
Why is your back up today?
basic
You don't have to get your back up every time I ask a question.
natural
The minute I mentioned her mistake, her back was up.
natural
Don't take it personally—it's not worth putting your back up over this.
natural