The phrase "something to chew on" is often used to describe information or an idea that requires thoughtful consideration. Synonyms for this phrase include "food for thought," "a mental workout," "something to ponder," and "a puzzle to unravel." These phrases convey the idea of intellectual challenge and encourage further exploration and examination. Other synonyms could include "a brain teaser," "an enigma," "a mystery," or "a riddle." Regardless of the specific terminology used, the implication remains the same - that the topic at hand requires some level of critical thinking and contemplation.