Amoulder

I can imagine thousands of the blue and the grey who long ago have amouldered in the grave, rising up to call the name of this man "blessed".

Source: wiktionary

What his men most often sang, while they actually were marching through Georgia, was another, and of its kind a great song: —“John Brown's body lies amouldering in the grave, But his soul goes marching on. […]

Source: wiktionary