Meaning of 一擲 in Japanese

Definition of 一擲

いってき(itteki) 【一擲】

けんこんいってき(kenkonitteki) 【乾坤一擲】

(n) stake all (on something); play for all or nothing; throwing all into a task
乾坤一擲の大勝負。情けないけどこれが見事空振りに終わったんだなあ。
It was all-or-nothing and we struck out spectacularly.

いってきせんきん(ittekisenkin) 【一擲千金】

(exp) being lavish with one's money; spending a huge sum of money at once on a treat