Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
How to pronounce attach in American English
Americans pronounce attach as uh-TACH (/əˈtætʃ/). Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "He used a drill to attach the brackets to the wall securely".
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Every sound in "attach".
2 syllables, 4 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Touch the tip or front edge of your tongue to the roof of your mouth just behind your teeth. Keep your jaw relaxed. Stop the air, then release with a puff.

Drop the jaw noticeably. Keep the body of the tongue low and forward, and don't let the back of the tongue raise toward the soft palate. Pull the lip corners back slightly, almost a starting smile.

Touch the front of your tongue to the roof of your mouth, then release into a 'sh' position. Flare your lips.

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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch TACH — keep everything else short and quick.
Pronouncing the first syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.

