通婚

tōnghūn
to intermarry

CEDICT

to intermarry; to become related by marriage

Wiktionary

两家结成婚姻关係。

重編國語辭典

互通婚姻

維基詞典

Entry Composition

1 通 tōng
  1. to go through
  2. to know well
  3. (suffix) expert
  4. to connect
  5. to communicate
  6. open
  7. to clear
  8. classifier for letters, telegrams, phone calls etc
2 婚 hūn
  1. to marry
  2. marriage
  3. wedding
  4. to take a wife