一斧子砍到底

yīfǔzikǎndàodǐ ㄧ ㄈㄨˇ ˙ㄗ ㄎㄢˇ ㄉㄠˋ ㄉㄧˇ

    • to settle a matter once and for all with one decisive action

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
chop all the way down with one axe stroke
Meaning
Settle a matter once and for all with one decisive action.

Sources