Adjective
not invented here (not comparable)
(business, engineering, idiomatic) Invented outside one's own organization (referring to the knee-jerk dismissal of products, technologies, etc. that come from third parties).
An idea which arises in the field, based on the direct experience of the people doing the job, cannot get going in a centrally controlled system... The not invented here (NIH) syndrome is one of the major curses of our society... Richard Hamming