Between is /bɪˈtwiːn/ in British and American English; stress the second syllable: be TWEEN, never BEE tween.
Then the tongue taps t while the lips round into w; hold ee; finish with n. Try Come and sit between us.
Keep the mouth relaxed and the lips neutral for the first beat, bi. It is the short vowel of bit, so do not stretch it. The strong form is /bɪˈtwiːn/, and in fast speech many varieties weaken the first syllable to /bəˈtwiːn/ with a schwa-like beat.
Round the lips slightly for w as the t releases, as in twin. The t stops the airflow first, then the lips squeeze forward while air flows again. Say twin alone, then be TWEEN.
Let the tongue tip press the tooth ridge for n while the lips stay apart and the sound hums through the nose. The vowel before it is long ee as in see, held a full beat, so the ending rhymes with tween, never bin.
Say it in a phrase: The cafe sits between the bank and the park. Let between carry the main beat, landing hard on tween.
Contrast the ending as a pure vowel drill. The last vowel is long ee as in see, never short i as in bit. Try the same frame both ways: be TWEEN, then hear the difference with the vowel of bit; only the vowel changes.
Say twin alone first. Feel your lips squeeze forward and round for w right after the t releases.
Stretch the ee a full beat: tweee, like the start of tweet without the final t. Then close with the ending, tween. Press the tongue tip to the tooth ridge for n, keep the lips apart, and let the sound hum through the nose.
Join the syllables together into the full word, be TWEEN, letting the first syllable stay short and light so the second carries the main stress.
- End with n: tongue tip presses the tooth ridge, lips stay apart, sound hums through the nose. Now join it: be TWEEN.
- End with n: tongue tip presses the tooth ridge, lips stay apart, sound hums through the nose. Now join it: be TWEEN.
Try a fuller sentence: I will be there between one and three. Keep the first syllable short and light, bi, so the stress stays on tween where it belongs.