Thin blue line

noun, slang

Definitions

Noun
  1. 1
    The police. collective, colloquial

    "Crime wave overwhelms thin blue line [title]"

  2. 2
    A flag or symbol representing the police, commonly associated with the blue lives matter movement.

    "“Obviously, you’ve seen caravans with the Trump flag in the back of pickup trucks and then the thin blue line,” Mr. DeMasi, a former police officer, said. “I think maybe people had a good intention, but it ended up giving the meaning of the thin blue line a black eye.”"

Etymology

By analogy with Thin Red Line. “Blue” refers to the color of the uniforms of many police departments.

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