sour grapes

Noun

literally plural plural-only idiomatic

Japanese Meaning

（文字通りの意味）熟していないために酸味があるぶどう。 / （慣用的な意味）手に入らないものに対して、あえて軽蔑するという態度を取ること。

The farmer tossed the sour grapes into the compost after tasting their sharp, unripe flavor.

農夫は未熟で酸っぱいぶどうを味見して、その強い酸味のために堆肥に捨てた。

Sense（1）

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

Sense（2）

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

Sense（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.