frat·er·nize /ˈfrætɚ/
  (vi.)結有深交,友善
  Fra·ter·nize v. i. [imp. & p. p. Fraternized p. pr. & vb. n.. Fraternizing ]  To associate or hold fellowship as brothers, or as men of like occupation or character; to have brotherly feelings.
  Fra·ter·nize, v. t. To bring into fellowship or brotherly sympathy.
     Correspondence for fraternizing the two nations.   --Burke.
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  fraternize
       v : be on friendly terms with someone, as if with a brother,
           especially with an enemy [syn: fraternise]