tumble to (something)
1. To fall or topple to some lower location or level. I feared the worst when I saw my grandfather tumble to the floor. He kicked the crate and watched it tumble to the basement.
2. obsolescent To arrive at some conclusion or understanding. I have since tumbled to the belief that animals prove far better companions than other people. It was only after the debt collectors began taking away our belongings that I tumbled to the reality of David's financial woes.
tumble to
v. Slang To come to some sudden understanding; catch on to something: I tumbled to the reality that the other card players were cheating.