Hello Valentin, the only words I know of for Позапозавчера in English are (like Firuz alrady said) the day before yesterday two days ago and I´ve also stumbled across "nudiustertian", which is probably not that common in everyday language... In German we have a very simple way to refering to Позапозавчера: "vorgestern" It is even shorter than in Russian :)

Couldn't resist answering this amusing question Valentin:) Another beautiful example of how rich and "flexible" Russian language is. As to the question itself, the short of it is no, no such thing as yester-yesterday. At least not commonly used. Two days ago would be a more appropriate way of saying it, though I admit it lack the gusto of Poza-poza-pozavchera (3 days ago) :) Peace!

No, thank you, professor

Sure, thanks.

Great