亲上加亲
qīn​shang​jiā​qīn

to cement ties by marriage

  1. 亲 親 qīn adjective
    close
    intimate; dear; related by direct blood line; close in relationship or feeling
  2. 上 shang locative
    on
    (suffix) on; in; at; on the surface of; used after a noun to indicate a location, scope, or aspect
  3. 加 jiā verb
    to add
    to add; to put in; to append; to place something on top of another; to perform addition in mathematics
  4. 亲 親 qīn adjective
    close
    intimate; dear; related by direct blood line; close in relationship or feeling