Simple past tense and past participle of abet.(verb)
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Use "abetted" in a sentence
"The decay of the military, resulting from decreased funding and the spread of corruption (both of which Yeltsin abetted: he had no interest in maintaining or strengthening an institution that was at best lukewarm toward his rule), was popularly perceived to have led to Russia's humiliating defeat during the first Chechen war, in 1994-1996."
"Not sure whether VDH cares to have nitpicky editorial / typo issues brought to his attention or not, but just in case, perhaps he in the first sentence means "abetted" rather than"
"He then said Obama "abetted" corruption in the home-mortgage market."