Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.

Americans pronounce crash as KRASH (/kræʃ/). You'll hear it in sentences like "The social issue caused a crucial crash".
Record yourself saying "crash" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 4 sounds. Explore each sound's mouth shape and how it's made.
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.

Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
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.

Flare your lips and lift the mid-front tongue close to the roof of your mouth. Blow air through without voicing.
