せんけつ
deciding first; settling (a matter) first; first priority
Common word
Noun, Suru verb, Transitive
打開策だかいさくを見みつけるのが先決せんけつだ。
In the first place we must find a way out of this.
君きみは煙草たばこを吸すうのをやめるのが先決せんけつだ。
First, you have to stop smoking.