Definition
An enemy combatant who slips through friendly lines during an assault, requiring rear security to deal with them. It's the military version of one mosquito getting through the screen door—annoying and potentially dangerous.
Example Usage
Despite the cordon, a leaker made it through the perimeter and was engaged by the reserve squad.
Origin
Infantry combat terminology from 20th century warfare describing enemies who 'leak' through defensive positions
Fun Fact
Dealing with leakers is why military units always maintain rear security—the enemy you missed is often more dangerous than the one you're facing.
Source: Infantry combat tactics terminology
Related Terms
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See “leaker” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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