fraternizer

/ˈfrætərnaɪzər/
noun
  1. A person who fraternizes, especially one who socializes with people in a way that is not officially allowed.
    • The company policy strictly warned that any fraternizer would face disciplinary action.
    • In the spy novel, the fraternizer was suspected of sharing secrets with the enemy.
    • The officer was known as a fraternizer, often chatting with the enlisted soldiers after hours.
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