with tooth and nail

with tooth and nail

Furiously or fiercely; with all of one's strength and effort. I know my brother has fought with tooth and nail to be re-elected, so his victory tonight is certainly well earned. The elite troops have been placed around the perimeter to defend the palace with tooth and nail from rioters.
See also: and, nail, tooth
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

tooth and nail, fight/with

Fight vigorously, with all one’s resources. The analogy to biting and scratching was drawn by the sixteenth century and has been used ever since for fierce contention or, by extension, effort. Dickens used it in David Copperfield (1850): “I go at it tooth and nail.”
See also: and, fight, tooth
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in classic literature ?
Then she fought him, as any jungle she might fight, with tooth and nail. The man found her no easy prey.
Tam Oulton-Doris, guitarist and vocalist with Tooth and Nail, said he organised the concert after hearing that the church needed money for upkeep and parish funds.