fraternize
verb [ I ] (UK usually fraternise) uk/ˈfræt.ə.naɪz/ us/ˈfræt̬.ɚ.naɪz/
（尤指与敌对一方或社会地位不同者）亲善，相处融洽
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? 这里的医生和护士关系融洽吗？
The soldiers were accused of fraternizing with the enemy. 士兵被指责与敌方过于友好。