←
Western Katu - (cognate)
←
Proto-Mon-Khmer *ɓ(ə)h (inherited)
←
Proto-Mon-Khmer *ɓah (mention)
←
Proto-Vietic *ɓǝh (inherited)
→
Vietnamese mở màn (compound)
→
Vietnamese cởi mở (compound)
→
Vietnamese mở cửa (compound)
→
Vietnamese mở đầu (compound)