masticar
/mastiˈkaɾ/ · B2 · verb
to chew
🦷🍽️ masticar = English mastication, from Latin masticare, to chew
Spanish masticar is the same word as English mastication, so link them directly. The figurative sense, to chew over an idea, matches English ruminate, which also means to chew cud and to think deeply.