Meanings of downward descent in English

There was a long pause, and my heart started its downward descent.

As her foot went up, everything else started a downward descent.

By what cultural treatment may this downward descent of the water be accelerated by the farmer?

The caps are floating in the air and are about to begin a sudden downward descent.

We were in front of the bonfire on our last evening, and the sun was just beginning its downward descent.

Tiny specks, visible to Dorn's powerful eyes, seemed to detach themselves and fall, to be followed by the plane itself in sheer downward descent.

Scotland had yet to begin their downward descent when Ireland arrived in Edinburgh for this rearranged (due to foot-and-mouth disease) Six Nations match.

Generally, this time of day, as the Sun Goddess, Aylis, started her downward descent into the sea, women would be making final preparations for supper.