fraternizeverb [ I ]
UK usually fraternise uk/ˈfræt.ə.naɪz/us/ˈfræt̬.ɚ.naɪz/to meet someone socially, especially someone who belongs to an opposing army or team, or has a different social position:
Do the doctors fraternize much with the nurses here?
The soldiers were accused of fraternizing with the enemy.
fraternization
noun [ U ] UK usually fraternisation uk/ˌfræt.ən.aɪˈzeɪ.ʃən/us/ˌfræt̬.ɚ.nəˈzeɪ.ʃən/