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допустить промах stresses
gen.	blunder; trip up (4uzhoj); miscue; slip up
Игорь Миг	foul up; do something dumb; make a blunder; make an unfortunate slip; drop a clanger
amer.	pull a blooper (Anglophile)
formal	make a faux pas (Wakeful dormouse)
idiom.	fall flat on face (Taras)
Makarov.	drop a clanger
obs.	be in default
obs., Makarov.	be in default
slang, Makarov.	fluff