A do-or-die stance: cutting off escape routes and making a last-ditch effort with no option but to win.
会社が存続の危機に陥り、社員全員が背水の陣で立ち向かった。
When the company faced an existential crisis, all employees confronted it with a do-or-die effort.
彼は借金を返すために背水の陣で勝負に出た。
He took a do-or-die gamble to pay off his debts.
試合終盤、チームは背水の陣で守備を固めた。
In the final moments of the match, the team tightened its defense in a last-ditch effort.