(Intransitive, slang, often with "to") To see through deceit.
Tumble is defined as to do somersaults, fall clumsily or stumble, or to cause someone or something to fall.
To observe or notice.
Find another word for get-onto. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for get-onto, like: catch on, get-wise, tumble, latch-on, cotton-on, twig and get-it.