bulwark
n. countablen. a strong wall or fence that protects a place from danger. It can also mean a person or thing that keeps a group or idea safe from harm.
n. a defensive wall or fence, typically one that protects a ship or a fortress from the sea. By extension, it refers to a person or institution that provides strong protection against a threat or change.
The castle's thick stone bulwark protected the village from invaders.
The new law was seen as a bulwark against corruption, ensuring that public officials remained accountable to the citizens.
In a world of rapid technological shifts, the university acted as a bulwark for traditional values, maintaining its rigorous academic standards despite the pressure to modernize its curriculum.
From Middle English bulwerk, from Middle Dutch bolwerk, bolwerc and Middle Low German bolwerk, equivalent to bole (“tree trunk”) + work. Cognate with German Bollwerk, Danish bolværk, Swedish bålverk, Dutch bolwerk. Doublet of boulevard (from French boulevard, from Dutch); cognate with Portuguese and Spanish baluarte and Italian baluardo.