dào dǐ
一竿子到底
yī gān zi dào dǐ
Go all the way to the end; see something through to the finish.
将革命进行到底。
jiāng gémìng jìnxíng dàodǐ.
Carry the revolution through to the end.
新方法到底试验成功了
xīn fāngfǎ dàodǐ shìyàn chénggōng le
The new method finally succeeded in the experiment.