He wished to struggle on to the end.

他定干到底。

You and your brother have come at me with both barrels.

你和你哥哥是下定干到底了。

So here we are to see things through.

们也只好硬着头皮干到底。

I'm the guy who'll do whatever it takes to stick it to them.

会不惜一切代价他们干到底。