Select the most appropriate meaning of the given idiom.

Fight tooth and nail

Fight very fiercely

The most appropriate meaning of the idiom "fight tooth and nail" is >Fight very fiercely.<

The idiom "fight tooth and nail" means to fight with all your strength and determination. It is often used to describe a physical fight, but it can also be used to describe a verbal fight or a fight for something, such as a cause or a goal.

The other options are not correct.

• "Win the competition" is not the same as "fight tooth and nail." You can win a competition without fighting tooth and nail.
• "Be in high spirits" does not mean to fight tooth and nail. Being in high spirits means to be happy and excited.
• "Insist on something" does not mean to fight tooth and nail. You can insist on something without fighting tooth and nail.