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большую глупость

a big mistake

→ большой
phrase Rare #49,932
a big mistake Used when someone does or says something very foolish. The form большую глупость is the accusative case, commonly used after verbs such as сделать (to make/do) and сказать (to say).
RU: Не делай большую глупость.
EN: Don't make a big mistake.

Я только что сказал большую глупость.

I just said something really stupid.

Я сказал большую глупость.

I said something very stupid.

Том сделал большую глупость.

Tom did something very stupid.