What is the meaning of Subduction?

This video, adapted from a Pacific Tsunami Warning Center animation, shows every recorded earthquake, in sequence, from January of 1980 to March of 2020 in California and surrounding states. Most earthquakes in the world, including those in the United States, are “interplate” earthquakes that occur at plate tectonic boundaries where large sections of the earth’s crust either grind past each other, pull apart, or slam together. With the exception of the Pacific Coast of Southern California, the c