What is common term for cancerous cells that have spread in the body?

The common term for cancerous cells that have spread in the body is metastasis.

When cancer cells metastasize, they break away from the original tumor and travel through the bloodstream or lymphatic system to other parts of the body. This can lead to the formation of new tumors in different organs and tissues. Metastasis is the most common way that cancer spreads and is the leading cause of death from cancer.