"Tumble to" is a popular phrase that means to realize or understand something. Some synonyms of the phrase include "figure out," "comprehend," "cognize," and "grasp." These words convey the idea of understanding something that may have been difficult or confusing at first. Other synonyms for "tumble to" include "catch on," "realize," "perceive," and "discern." These words indicate the moment when a person finally understands or becomes aware of something important. Using these synonyms can add variety to your writing and help you express your ideas and thoughts more effectively.