REDOUBT

[noun] [C] [formal] - something which maintains or defends a belief or a way of life, esp. one that is disappearing or threatenedThe party's reputation as a staunch redoubt of high moral probity has taken a bit of a knock since the scandal.He described British public schools as 'the last redoubt of upper-class privilege'.(specialized) A redoubt is also a small, often hidden, building in which soldiers can hide themselves while they are fighting.He spoke of secret underground redoubts, from which troops would pour when enemy tanks tried to pass.