Dictionary

become one flesh en · VERB

(idiomatic, of two persons) To join together in marriage; to develop a unifying bond as a result of marrying.
- Just when it seemed like BRAD PITT and GWYNETH PALTROW were moving so smoothly into becoming one flesh that they even had the same haircut, they abruptly called it all off. 1997 June 30, “People: A Bit of a Fit Over Pitt Split”, in Time:
- “When my husband and I got married, we became one flesh,” Drummond wrote in a recent post. 2011 February 11, Jennifer Schuessler, “Inside the List”, in New York Times, retrieved 02 Nov 2012:
- "We must become one flesh without any delay, Jane: there is but the licence to get—then we marry." 1847, Charlotte Brontë, chapter 37, in Jane Eyre:

Spelling	Features	Source
become one flesh	Tense=Past, VerbForm=Part	lexicographic
became one flesh	Tense=Past	lexicographic
becomes one flesh	Number=Sing, Person=3, Tense=Pres	lexicographic
becoming one flesh	Tense=Pres, VerbForm=Part	lexicographic