プログレッシブ和英中辞典(第4版)の解説
いっしょう【一生】
❶〔生涯〕a lifetime; one's whole life
一生に一度の好機だ
This is 「the chance of a lifetime [a once-in-a-lifetime chance].／This is the opportunity of a lifetime.
そんな好運は一生に二度とない
Such a chance never comes twice in a lifetime.
人の一生は短い
One's span of life is short.
彼はその仕事に一生を捧げた
He devoted his (whole) life to the work.
一生を安楽におくる
live comfortably to the end of one's life
泣いて暮らすも一生，笑って暮らすも一生
Life is life whether spent in tears or laughter.
彼女は一生独身で過ごした
She remained single all her life.
一生の仕事
one's lifework／〔一生かかる仕事〕lifelong work
一生のお願いだ
This is the only request I will ever make of you.
あなたのご親切は一生忘れません
I shall [《米》 will] never forget your kindness as long as I live.
彼はこの町で一生を終えた
He died in this town.
❷〔生命〕
彼は戦場で九死に一生を得た
He escaped certain death on the battlefield by a hair's breadth.／He had a narrow escape from death on the battlefield.