There are numerous antonyms for the phrase "gave a tumble" which means to understand or comprehend something. Some of the antonyms include befuddled, puzzled, confused, mystified, baffled, bewildered, and daunted. These words describe a state of confusion where an individual is unable to make sense of something. For instance, if someone says something that you don't understand or if you face a complex problem that you cannot solve, this can leave you feeling befuddled, puzzled or confused. On the other hand, if you are able to resolve the issue or make sense of the situation, you can use the phrase "gave a tumble" to describe your comprehension.