Final answer:
The verb describing the process by which cancer spreads from the primary site to a secondary site is metastasize.
Step-by-step explanation:
The verb describing the process by which cancer spreads from the primary site to a secondary site is metastasize. Metastasis is the term used to describe the process, and the new cancers that form are called metastases. Cancer cells can spread through the blood to distant sites and form new tumors in other organs or tissues.