/u/ This is a short, close, back, rounded vowel.
“Close” means that the tongue is positioned as close as possible to the roof of the mouth without creating a constriction that would be classified as a consonant.
“Back” means that the tongue is positioned as back as possible in the mouth without creating a constriction that would be classified as a consonant.
“Rounded” means that the lips are protruded: the corners of the lips are drawn together, and the inner surfaces exposed.
Watch the video and practise this vowel here (no comments about the woman’s hairstyle, please!).
You can also do exercises about similar sounds /u/-/u:/
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