say–so 
/ˈseɪˌsoʊ/ noun
/ˈseɪˌsoʊ/ noun [noncount] informal 1 : a statement that is not supported by any proof
▪ He said he did the work himself, but we have only his say-so that that's what actually happened. 2 : permission that is given by a person who has authority
▪ She left the hospital on the say-so of her doctor. ▪ Nothing was done without his say-so. 3 : the power to decide something
▪ She has the ultimate say-so on/over what will be taught.
▪ He said he did the work himself, but we have only his say-so that that's what actually happened.
▪ She left the hospital on the say-so of her doctor. ▪ Nothing was done without his say-so.
▪ She has the ultimate say-so on/over what will be taught.
