The term 'not take 'NO' for an answer' can be summarized as insisting on a particular outcome. This phrase is often used to describe someone who is determined to get what they want and will not accept any other result. It implies that the person is unwilling to compromise or accept any form of refusal. The crossword solution for this phrase is 'INSIST, ' which means to demand something with authority or to be very persistent in asking for something.