A fortified position established jointly by two armies or forces, or a military term for a shared strategic location across a bridge.
From 'co-' (joint) plus 'bridgehead' (a military position secured at the end of a bridge for advancing forces). Military terminology from modern warfare.
In WWII, allied forces had to establish 'cobridgeheads' after D-Day—shared defensive positions that required enemies-turned-allies to literally fight side-by-side, creating strange bonds between soldiers.
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