Select the most appropriate meaning of the given idiom.

To fight tooth and nail

To fight or compete with great ferocity and intensity

The most appropriate meaning of the idiom "to fight tooth and nail" is to fight or compete with great ferocity and intensity.

It means to fight with all your strength and determination, using every means available to you. The idiom comes from the literal meaning of fighting with your teeth and nails, which is a very difficult and painful way to fight.

The other options are not correct.

• To silently leave the scene of battle: This is not the meaning of the idiom "to fight tooth and nail".
• To use unusual weapons to fight: This can be part of fighting tooth and nail, but it is not the main meaning of the idiom.
• To keep the enemy guessing about the weapons used: This is not the main meaning of the idiom "to fight tooth and nail".