Definition

An underground or heavily fortified defensive structure where soldiers hide while terrible things happen above them. A reinforced underground shelter designed for protection from artillery and airstrikes.

Example Usage

The soldiers retreated to the bunker system as enemy artillery bombardment began.

Origin

Military fortification term; WWI origin in common usage

Fun Fact

Deep bunkers can protect against most conventional weapons, but they're psychologically draining because you're literally trapped underground.

Source: Military Fortifications and Defense

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