The definition of fraternize is to chat in a friendly, brotherly way, or to get close to an enemy.
An example of fraternize is to mingle with coworkers at a party.
An example of fraternize is to date someone on the side you are fighting against.
To associate with others in a brotherly or congenial way.
To associate on friendly terms with an enemy or opposing group, often in violation of discipline or orders.
To associate in a brotherly manner; be on friendly terms.
To have intimate or friendly relations with any of the enemy.
Origin of fraternize
French fraterniser from Medieval Latin frāternizāre from Latin frāternus fraternal fraternal