一竿子插到底

yīgānzichādàodǐ ㄧ ㄍㄢ ˙ㄗ ㄔㄚ ㄉㄠˋ ㄉㄧˇ

    • to carry a matter through completely in one go
    • to go straight down to the grassroots level

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
stick a pole all the way to the bottom
Meaning
Either carrying a matter through completely in one go, or leaders going straight down to the grassroots level.

Sources