Learn English – Idiom / expression for someone who forgets their roots on achieving success

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I am having difficulty finding an English idiom / expression to describe these situations:

  • A person who was previously poor then becomes arrogant because she/he is rich now.

  • A person who has been helped (because she/he really needs it) but she/he just walks away (and forgetting the person who has helped her/him) after achieving a comfortable state.

Is this appropriate: "A rolling stone gathers no moss"?

My native proverb is: "The nut that forgets its skin"

Best Answer

Such a person can be said to have "forgot where he came from", meaning he's forgotten his humble roots and is acting as if he was born to wealth.

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