If you fraternize with someone, you associate with them in a friendly way.
例句
At these conventions, executives fraternized with the key personnel of other banks...在這些集會上，主管們和其他銀行的重要人員友善往來。Mrs Zuckerman does not fraternize widely...朱克曼夫人結交并不廣泛。
英漢詞典釋義
vi.
結交,交友,(尤指)親敵
Soldiers from the two armies stopped fighting and fraternized.兩軍士兵停止作戰，并友好地交往。The soldiers were forbidden to fraternize.士兵被禁止與敵兵親善。
英英詞典釋義
Verb
1. be on friendly terms with someone, as if with a brother, especially with an enemy