/ ˌdɪsəˈvaʊ; NAmE / verb
[ vn ] ( formal ) to state publicly that you have no knowledge of sth or that you are not responsible for sth/sb :
They disavowed claims of a split in the party.
► dis·avowal / -ˈvaʊəl; NAmE / noun [ C , U ]
••
WORD ORIGIN
late Middle English : from Old French desavouer .