expression
come hell or high water; no matter what; even if it kills me
Idiomatic expression conveying strong determination to achieve something despite any difficulty. Often used with verbs of effort or perseverance.
See also: 石にかじりついても
石にかじりついてでも、このプロジェクトを成功させたい。
I want to make this project succeed, come hell or high water.
石にかじりついてでも、彼は大学を卒業するつもりだ。
He intends to graduate from university, no matter what.
Literally 'even if I have to gnaw on a stone', an idiomatic expression emphasizing extreme perseverance. The exact origin is uncertain, but it likely arose from the vivid image of biting into something hard to convey unyielding determination.