To stumble is to trip or fall over something, or to make a clumsy mistake.
When we use the word "stumble", we usually mean that someone accidentally did something silly or didn't pay attention. Imagine walking through your house with your eyes closed - you might trip over a chair and stumble into the wall. That's what it means to stumble in English! But it can also happen when we're trying to do something tricky, like using a new gadget or learning a new skill. We might make a mistake or get our wires crossed, and that's when people say "Whoops, I stumbled over that!"
A fall, trip or substantial misstep.
To trip or fall; to walk clumsily.
Example: He stumbled over a rock.
