verb. ['ˈstʌmbəl'] walk unsteadily.
verb. ['ˈstʌmbəl'] miss a step and fall or nearly fall.
verb. ['ˈstʌmbəl'] encounter by chance.
verb. ['ˈstʌmbəl'] make an error.
noun. ['ˈstʌmbəl'] an unsteady uneven gait.
noun. ['ˈstʌmbəl'] an unintentional but embarrassing blunder.