1.b> (over, on) (); i> ; the child stumbled and fell / ; I stumbled over a rock , ; in her hurry she stumbled and spilled the milk all over the floor ;
2.b> / i> (, ) / ; we were stumbling around in the dark looking for a candle - ; he stumbled upstairs and into bed / ;
3.b> (), "" (, .i>); the newsreader stumbled over the name of the Russian tennis player i> / ; in her nervousness she stumbled over her words / ; I stumbled through the piano piece with difficulty / ;
4.b> (across, on, upon) i> ()i> () / , i> ; researchers have stumbled across a drug that may help patients with Parkinson's disease / i> , ; workmen stumbled upon the mosaic while digging foundations for a new building i> .