noun
loyal spirit; the loyal dead
Refers to the spirit of loyalty, especially of soldiers who died for their country. Often used in memorial contexts such as 忠魂碑 (monument to the war dead). The sense 'the loyal dead' is a metonymic extension.
忠魂碑の前で献花した。
We offered flowers in front of the monument to the loyal dead.
彼の忠魂は今も語り継がれている。
His loyal spirit is still talked about today.