To stake everything at once; an all-or-nothing gamble — a four-character idiom for risking everything on a single throw.
彼は起業資金を集めて、最終的に乾坤一擲の勝負に出た。
He gathered startup funds and finally took an all-or-nothing gamble.
試合の最終セットで彼女は乾坤一擲のサーブを打った。
In the final set she served as if it were an all-or-nothing gamble.
経営陣は新商品の投入を乾坤一擲の判断と位置づけた。
Management regarded the launch of the new product as an all-or-nothing decision.