fraternise

/ˈfrætərnaɪz/
verb
  1. To associate or be friendly with someone, especially when such behavior is not officially allowed or expected.
    • The coach told the players not to fraternise with the opposing team before the match.
    • It is common for diplomats to fraternise with foreign officials at social events.
    • During the conference, employees from different companies began to fraternise in the lobby.
Antonyms
What does "fraternise" mean? | whatsthatwordmean | whatsthatwordmean