sour grapes

noun

He always complains about other people's success, but it's just sour grapes.

意味（1）

(literally) Grapes that are acid due to lacking maturity.

意味（2）

(idiomatic) Things that somebody pretends to despise because they cannot obtain or have.

意味（3）

(idiomatic) A putting down or expression of disdain about something that one desires but cannot have.

I think his comments about that new car are just sour grapes because he can't afford it.