What does it mean to be one flesh in a marriage?

This article has been translated into the following languages:

Afrikaans العربية বাংলা Bosanski Български Cebuano Čeština 中文 中國話 Dansk Deutsch Español فارسی Français Ελληνικά हिन्दी Hrvatski Bahasa Indonesia Italiano 日本語 Kiswahili 한국어 Latviešu Lietuvių Magyar मराठी Nederlands Polski Português Română Русский සිංහල Slovenčina Slovenščina Srpski Suomi Tagalog தமிழ் తెలుగు ไทย Türkçe Українська اردو Tiếng Việt