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gen.	make a great mistake (According to grammarian Michael Swan, both "great" and "big" are acceptable, the difference being "big" an informal word.: You are making a great / big [informal] mistake. ART Vancouver); make a big mistake (According to grammarian Michael Swan, both "great" and "big" are acceptable, the difference being "big" an informal word.: You are making a great / big [informal] mistake. ART Vancouver)
austral., slang	put one's foot in it
dipl.	commit a blunder; make a blunder

совершить большую ошибку: 2 phrases in 1 subject

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