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for (one's) (own) sake
Out of regard or respect for someone or oneself; for the benefit, advantage, or good of oneself or another person. For my own sake, I'm going to take a few extra days off at Christmas to spend with my family. For Jonathan's sake, we need to be sure to find a restaurant that is sensitive to peanut allergies.
for someone (or something's) sakeand for the sake of someone or something
for the purpose or benefit of someone or something; to satisfy the demands of someone or something. I made a meatless dinner for John's sake; he's a vegetarian. The teacher repeated the assignment for the sake of the slower students.
for one's (own) sake
for one's good or benefit; in honor of someone. I have to earn a living for my family's sake. I did it for my mother's sake.