後ご生しょう一いっ生しょう

noun

once in a lifetime; extremely important (request)

A set phrase used to emphasize that a request is extremely important or a once-in-a-lifetime opportunity. Often used in the pattern 後生一生のお願い.

• 後ご生しょう一いっ生しょうのお願ねがいですから、どうか助たすけてください。

  This is a once-in-a-lifetime request, so please help me.