The structure combines "thin" with "blue line" (referring to police uniforms), forming a metaphorical noun phrase that visualizes police as a slender barrier. It is used to describe the police, seen as the barrier between order and chaos, with the "blue" representing law enforcement and the "line" symbolizing their role in holding back criminality and social disorder. People typically invoke the "thin blue line" in discussions about police support, memorials for fallen officers, or debates about public safety.

英語での「thin blue line」の定義と意味

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