[UK and ANZ] usually -ise [verb] [I] - to meet someone socially, esp. someone who belongs to an opposing army or team or has a different social positionDo the doctors fraternize much with the nurses here?(disapproving) He accused the England team of fraternizing too much with the opposition.
FRATERNIZE
Meaning of FRATERNIZE in English
Cambridge English vocab. Кембриджский английский словарь. 2012