A: I’m really angry. I’ve just heard some bad news.

B: What’s up?

A: It’s the cafe I go to. They’ve decided to become a vegan cafe — no more meat! Where am I going to buy my bacon sandwich from now?

B: There could be worse things to get angry about.

A: Really? I don’t think so. I’m going to fight tooth and nail to get them to change their mind.

Note: If you fight tooth and nail for something, you fight as hard as you can to get it or achieve it. This idiom means “to fight vigorously, with all one’s resources.” The analogy to biting and scratching was drawn by the 16th century and has been used ever since for fierce contention or, by extension, effort. Dickens used it in “David Copperfield” (1850): “I go at it tooth and nail.” You can also say that you fight tooth and claw to achieve something.