Terms for subject British

English	Russian
don't be a chump	не валяй дурака (ART Vancouver)
don't be an ass	не валяй дурака (Don't be an ass! You're not going out with George after what he did to you! ART Vancouver)
don't be an ass	не дури (Don't be an ass! You're not going out with George after what he did to you! ART Vancouver)
don't be daft!	не дури!
don't be daft!	не валяй дурака!
don't teach your grandmother to suck eggs	не учи учёного (Anglophile)
H. D. T.	кривизна уровенной поверхности
H.T. side	сторона высокого напряжения (high-tension side; напр., трансформатора)
haven't seen you for yonks	давно тебя не видел
haven't seen you for yonks	тысячу лет тебя не видел
he was banged up for 16 years for a murder that he didn't commit	он был посажен в тюрьму на 16 лет за убийство, которого не совершал (ssn)
I shouldn't wonder	не удивлюсь если ... (Anglophile)
L.T. side	сторона низкого напряжения (low tension side; напр., трансформатора)
mustn't grumble	грех жаловаться (Clepa)
you couldn't make it up!	Нарочно не придумаешь! (Said in reference to something too astonishing to be believed: ‘it is so ridiculous, you couldn't make it up' Bullfinch)