TO FIGHT TOOTH AND NAIL

Sometimes you use all your means and resources to achieve something in your life, or you put in a lot of efforts to oppose someone or something. To fight tooth and nail basically means to use all your resources to win a struggle. So to overcome a difficult opposition with someone, you fight tooth and nail. To win, you give it your best shot and leave no stone unturned. So when you fight tooth and nail for something, you will do anything and everything to get what you want.

You will use all your means or resources to be an achiever or a winner. For example, when two countries are battling a war, they fight tooth and nail, it means they use all their resources like manpower, weapons and technologies. To win, they are ready to even sacrifice their lives for their country.
Example 01 : James told Maria, " What a tough match ! They fought tooth and nail to win the world cup."
Ex 02 : Ben assured his father, "I'm going to fight tooth and nail to win the Inter-school elocution competition.
Ex 03 : To increase the literacy rate, The people fought tooth and nail to get new schools opened in their town.
Ex 04 : Both of the brothers, Peter and Andrew fought tooth and nail to get a higher share in their family business.
Ex 05 : Michelle told Kelly, "if my family disapproves of my boyfriend, I will fight them tooth and nail just to be with him." 
Ex 06 : The senior doctor fought tooth and nail to revive the patient who met with a fatal accident, he resorted to all the means like using the shock treatment.
Ex 07 : In some countries, women had to fight tooth and nail for their basic rights such as education.
Ex 08 : Richard is fighting tooth and nail to gain custody of his children as he is he divorcing his wife.
Ex 09 : On a lonely street, when Jack was attacked by a gangster, he fought tooth and nail, and later managed to reach the police station.
Ex 10 : During the promotion of a film, the fans and photographers fought the security tooth and nail to get a glimpse of their favorite star.
Ex 11 : Little John and Mary always fight tooth and nail to get the first turn to play games on their father's laptop.