(one) won't take no for an answer

One will not stop with what one has planned or desires, regardless of others' lack of agreement. Once my brother gets his mind made up, he won't take no for an answer, so don't bother trying to reason with him. I know you think you can't accept this, sweetheart, but this car is a gift from your grandmother and me—we won't take no for an answer! How am I going to get out of going to this stupid party? Liz doesn't want to go alone, and she won't take no for an answer.

won't take no for an answer

Will not accept a refusal. This term dates from the mid-1800s; it appeared in Thomas Halliburton’s Sam Slick’s Wise Saws (1853). Its frequent repetition makes it a cliché. The Washington Post had it headlining an article by Dan Froomkin about President Obama’s position on health care, “Obama Won’t Take No for an Answer” (June 26, 2009). Also see what part of no don’t you understand?