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What is a word or phrase for "people who fake niceness temporarily to get benefits"?

pyobum
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1 Answers1

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To act on self- interest , is an expression that may fit in your context.

  • personal advantage or interest.
  • he was so nice to me just out of self-interest.

To ingraziate may suggest a behavior which aims at a personal advantage

  • to establish (oneself) in the favor or good graces of others, esp. by deliberate effort: to ingratiate oneself with the boss.

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