
Bulwark
Metaphorical Use
Often used metaphorically to describe something that provides strong support or security in various situations.

A good education can be a bulwark against poverty.
Non-Physical Protection
Not always something you can touch; it can be an idea or action too.

Freedom of speech is a bulwark of democracy.
Compare with
BarrierBastionDefenceFortificationProtectionRampartSafeguardShieldWall
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