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.
How to pronounce rarely in American English
Americans pronounce rarely as RAIR-lee (/ˈrɛrli/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "Learning a new role is rarely easy" or "Rather rarely, the rabbit ran right" — more examples below.
Now you try.
Record yourself saying "rarely" and play it back. The mic stays on your device — nothing's uploaded.
Every sound in "rarely".
2 syllables, 4 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Start with the 'eh' vowel mouth position. Pull the tongue back and up while flaring the lips for the 'r'.
Place the tip of your tongue against the alveolar ridge just behind your top front teeth, the same contact point as /t/, /d/, and /n/. The difference is what happens to the air: for /l/, you let it flow continuously around the <em>sides</em> of the tongue (that's why /l/ is called a lateral). Turn your voice on the whole time. Lips stay relaxed, no rounding or flaring. For the Dark L variant at the end of a syllable, also pull the back of the tongue up and back toward the soft palate.

Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.

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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 first syllable, not the others. Stretch RAIR — keep everything else short and quick.
Pronouncing the "R" too clearly.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.

