Vowels carry the volume and the pitch of speech, and under low energy or nerves, the jaw tends to stay nearly closed, which collapses distinct vowels toward the same flat, central sound — the “uh” that makes a voice sound flat regardless of what’s actually being said.
The fix is a slightly more open jaw and a genuine shape for each vowel, rather than a shortcut through the middle of the mouth.
Try this now. Say the words “bat,” “bet,” “bit,” “bot” and “but” slowly, opening your jaw noticeably more than feels necessary on each one. Notice how different they feel to produce when properly shaped, compared with saying them quickly in a sentence, where they often blur toward the same shape.
This isn’t about exaggerating vowels in conversation — that reads as performative rather than clear. It’s a rehearsal exercise: over-shape in practice, and a more moderate but still genuine shape survives into normal speech.
