This expression metaphorically means to respond to a situation or threat in kind - for example, if they are going to fight dirty so will we, or if that company is going to slander us in their ads, we will do the same. It means to use the same weapons, techniques or strategies used by your opponent, competition or foe.
It also has a literal meaning. In fighting forest fires, fire itself is often used to stop the renegade fire from spreading. This is done by burning a wide section of forest or field ahead of the fire, so that when it reaches that point it will have nothing to burn and will fizzle out.
Does it make sense? Yes, so it's not an idiom. It's a proverb.
This idiom means: you are ready to fight with energy and determination for what you believe in.
"Ready aim fire" is an example of an idiom, which is a phrase that has a figurative meaning different from its literal meaning. This idiom is often used to encourage someone to take action or to get prepared before acting.
It's not an idiom because you can figure out the meaning by context - you are willing to go through dangers or hardship for something or someone.
The term "fight fire with fire" came from Metallica's 1984 album, Ride the Lightning's song "Fight Fire with Fire". The meaning is to respond to the attack with the same method.
This is not an idiom. An idiom is an expression whose meaning cannot be deduced from its elements. To go through fire and water for someone is easily understood to mean to make a special effort and to undergo difficulties for that person's sake.
"To be" is not an idiom - it's a verb.
It's raining cats and dogs outside. meaning- it's raining very hard outside. The two brother' fight like cats and dogs. meaning- the two brothers always fight.
Pest is not an idiom. It's a word.
"Kindle" is the small fire to start a larger fire, as every girl-guide or boy scout knows. The idiom means to start the person's inner, deep drives, so that eventually the results are visbile outside the person. The idiom describes the actions of good parents and good mentors.
The idiom "apple shiner" means the teacher's pet.
This is not an idiom. It is an expression whose meaning may be deduced from its component parts, unlike an idiom, whose meaning cannot be deduced from its component parts. It means having extremely limited options while being forced to act, like a person who is cornered in a fight.