Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Americans pronounce spoil as spoyl (/spɔɪl/). It's 4 sounds in 1 syllable. The vowel glides through two positions, not one fixed shape — keep both halves audible.
Record yourself saying "spoil" 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.
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Press your lips together to stop the air, then release. No vocal cord vibration.

Start with rounded lips and tongue shifted back. Glide to relaxed lips with the tongue arching forward and up.
Keep the tongue tip down and pull the back of the tongue up toward the throat. The 'dark' sound comes from the back.
