The author's intention is to keep everyone guessing until the bitter end.

这位作者的意图是在最终结尾前让所有人都猜不透。

《柯林斯英汉双解大词典》

It is always easy to be logical. It is almost impossible to be logical to the bitter end.

合乎逻辑往往很简单，然，坚守逻辑到痛苦的终点却几乎不可能。

youdao

Nor does anybody really know how much Mr Bush's proposals will end up costing, and the bitter lesson of the past is that it is unwise to believe the figure that is given at the outset.

没有人能够真正知道布什先生的计划最终要花费多少美金。 过去有过的沉痛教训是：相信最初公布的数字是不明智的。

youdao

Al Arabiya TV reports that the government is welcoming the Houthi rebel leader's offer to negotiate to put an end to the bitter fighting which has devastated parts of Saada province.

VOA: standard.2009.10.11

Mehdi Karroubi, a former speaker of parliament and a senior cleric with a wide following among some ethnic minorities, says he is determined to stay in the race to the bitter end.

ECONOMIST: Iran's presidential choice