tooth and nail
adv.
With every available resource; with unrelenting effort: “Bureaucrats would correctly see this as a curb on their power and would fight tooth and nail against it” (George R. Packard).

[TahlilGaran] American Dictionary ▲

tooth and nail
fiercely, (fighting) as hard as possible
We fought tooth and nail to build the new wing of the hospital.

The man decided to fight tooth and nail to transfer to another department of the company.

[TahlilGaran] English Idioms Dictionary ▲

tooth and nail
See: HAMMER AND TONGS.
{adv. phr.} With all weapons or ways of fighting as hard as possible; fiercely. - Used after "fight" or a similar word.
When the Indian girl was captured, she fought tooth and nail to get away.

The farmers fought tooth and nail to save their crops from the grasshoppers.

His friends fought tooth and nail to elect him to Congress.

[TahlilGaran] English Idioms Dictionary ▲