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sink or swim; all or nothing; hit or miss; make or break
一かばちか転職を決意した。
I decided to take the plunge and change jobs.
一かばちかの勝負に出るしかない。
There's no choice but to go all or nothing.
一かばちかで新しいビジネスを始めた。
I started a new business as a make-or-break bet.