Touch the tip of your tongue to the roof of your mouth just behind your teeth. Add vocal cord vibration as you release.

Americans pronounce day as DAY (/deɪ/). You'll hear it in sentences like "It's a beautiful day, isn't it?" or "It's a beautiful day for a hike" — more examples below.
Record yourself saying "day" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 2 sounds. Explore each sound's mouth shape and how it's made.
Touch the tip of your tongue to the roof of your mouth just behind your teeth. Add vocal cord vibration as you release.

Start with your jaw slightly open and the front of your tongue forward and slightly up. Glide upward, your jaw closes a little more and your tongue arches higher toward the roof of the mouth.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.