The term 'IN THE __ (INFORMED)' is composed of two words, 'IN THE LOOP' and 'KNOW'. The phrase 'IN the LOOP' is used to describe someone who is informed about a situation or event. It implies that the person is included IN the communication process and is aware of the latest developments. The word 'KNOW' means to have knowledge or understanding of something. Together, these two words form the phrase 'IN the KNOW', which is used to describe someone who is well-informed and up-to-date on a particular topic.