The line of fire is a fundamental concept in military strategy.

I have many irons in the fire right now.

The trial by fire has shown its strength and resilience.

It's important to add fuel to the fire to attract the attention of investors.

I don't want to throw cold water on it, but I think we should evaluate this decision carefully.

You shouldn't play with fire, you could get hurt.

Do not add fuel to the fire, it could make the situation worse.

Thanks to Giovanni, we managed to pull the chestnuts out of the fire.

I can put my hands on the fire for your honesty.