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сумасбродствовать vstresses
gen. behave wildly (Anglophile); rave (Anglophile); behave extravagantly (Anglophile); do extravagant things (Anglophile); behave whimsically (Anglophile); doat; dote
inf. to extravagantly; get up to nonsense (Andrey Truhachev)
obs. delirate