to disappear; to fade away

It drew strength from the not-so-young people who braved the bitter cold and scorching heat to knock on doors of perfect strangers, and from the millions of Americans who volunteered and organized and proved that more than two centuries later a government of the people, by the people, and for the people has not perished from the Earth.

He disappeared without a trace.

The tropical rainforests, located in a narrow region near the equator, are disappearing so fast that by the year 2000 eighty percent of them may be gone.

The drum faded away.

I want to submerge myself in the ocean depths, and to disappear there so as to never be seen again.