The Greek and Hebrew that is often translated into English as “(the two) shall become one flesh” is translated as “become just one” in Copainalá Zoque and San Mateo del Mar Huave or with existing idiomatic equivalents such as “become one blood” in Mitla Zapotec, “become the complement of each other’s spirit” in Tzeltal (source for this and above Bratcher / Nida), or “tie with wife as one, so that they tie one insides” in Luang (source: Kathy and Mark Taber in Kroneman (2004), p. 539).
See also I am your bone and flesh.