waste matter or residue from brewing or food processing, such as distiller's grains or bean dregs

to remove the dross; to get rid of the useless or harmful parts of something while keeping the essence

Keep what is best or useful while throwing away what is worthless or harmful; used as a slogan for being selective when adopting foreign ideas or traditional culture.traditional culture.

solid residue remaining after oil has been extracted from soybeans, often used as animal feed