3. for God's sake. Also
for goodness or heaven's or Pete's or pity's sake . An exclamation showing surprise, impatience, anger, or some other emotion, depending on the context. For example,
For God's sake, I didn't expect to see you here, or
Hurry up, for goodness sake, or
For heaven's sake, how can you say such a mean thing? or
For pity's sake, finish your dinner. The variants are euphemisms for God. [c. 1300] For a synonym, see
for the love of, def. 2.