chēng​xiōng​dào​dì

to call each other brothers

  1. to call
    to call; to name; to address as; to be known as
  2. older male friend
    (bound form) a polite way for men to address or refer to their male friends or peers
  3. dào verbparticle
    to say
    to say; to speak (often introducing a direct quote in literature)
  4. noun
    younger brother
    (bound form) younger brother; a junior male relative of the same generation; a junior male friend