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Хоть убей = can't for the life of me

Хоть убей, я не знаю = I don't know this for the life of me

are you also learning English?

It's a false friend, actually. This word has several meanings, but rarely, if ever, refers to boys' highest singing voice. Дискант, on the other hand, is very specific.[/quote]

so the range of a...

In English the word for this is, surprisingly enough, descant. :)

Radomir, are you translating it from Russian into English?