expression
for goodness' sake; I beg of you
A pleading expression used when earnestly asking someone to do or not do something. Often carries a tone of desperation or strong entreaty. The phrase is a fixed expression and not broken down into separate words in modern usage.
後生だから、もう一度だけチャンスをください。
For goodness' sake, please give me just one more chance.
後生だから、その話はやめてくれ。
I beg of you, stop talking about that.