The Vietnamese word "bán phụ âm" translates to "semi-consonant" in English. It refers to a specific type of sound in the Vietnamese language that behaves like both a consonant and a vowel, but is not fully either.
In summary, "bán phụ âm" or "semi-consonant" is an important concept in Vietnamese phonetics. It helps shape the sounds of the language and plays a significant role in pronunciation and syllable formation.