How to pronounce “press down on” in English

If you press down on a piano key, you'll have the experience of feeling the key move down at the same moment

Flatten it, press down on the breastbone, and then cook that on a rack over a huge mound of stuffing, which is also one of

- I have a can of freeze spray here, which is a liquid that when I press down on this button, comes out and immediately evaporates

The lamp board actually has a small little light underneath each of the letters, so when you press down on a key, a light lights up.