butter someone up

This week’s idiom is  “to butter somebody up.”

What does it mean “to butter somebody up?”

When you butter someone up, you flatter them or you are very nice to them, especially if you want to obtain something.

Example:

He was so keen to get the job that he spent his time buttering up the boss.

Questions:

Do you know of any idioms in your language that have the same or similar meaning?

Is it common in your country to butter someone up?

Have you ever buttered someone up for a job or for a better grade in school?