until the bitter end

1 到底

whatever just however ever heck blaze deuce bottom come down to bedrock get down to bedrock in God's name in thunder beneath the sun in damnation for Christ's sake for God's sake for goodness sake for heaven's sake for mercy's sake for pity sake in Heaven's name till the bitter end in the world in nature the devil to the death to the very end to the bitter end

2 拚命

cutthroat desperately for very life tooth and claw till the bitter end for life like hell in desperation for dear life tooth and nail to the bitter end

3 奋斗到底

to the bitter end

4 坚持到底

stick out stay the course stick it out to the bitter end