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портачить vacentos
gen. blunder; tinker (mikhailS)
Игорь Миг foul up
argot botch
Gruzovik, jerg. bungle (impf of напортачить)
inf. mess up (george serebryakov)
makár. arse up; cocker up; make a cock-up of something
rudo goof up; fuck with (Abysslooker); fuck up; screw up