Wiktionary
vb. 1 (context figuratively English) To discover or find something by accident. 2 (context figuratively English) To meet somebody by chance.
Usage examples of "stumble upon".
What Im thinking now is that its a place no one without magery could stumble upon, a place where the mageborn could learn to use their powers safely, without risking harm to others, and without a chance to use them wrongly: there are no peasants to rule.
When men reached this area, as they soon would, they would sometimes in autumn stumble upon such a ball of writhing snakes—.
Except for brief notoriety while being bombed by American naval forces during World War II, few people had ever heard of Marcus Island until a Japanese developer just happened to stumble upon its desolate beaches.
Once he finds them, they stumble upon the wrecked Towani ship - and Cindel, trapped in a cabinet.
The entire adult population of Britain is on the alert for spies, and the risk is that some idiot civilian will stumble upon some aspect of your operations.
There had been no sign of any habitation for some miles, and Terrel was confident that no one was likely to stumble upon him here.
There, ivory to buy a kingdom lay, waiting for some bold adventurer to stumble upon it.
He had an idea that he would slip out of sight for a while and then take up quarters in some outlying section of the city where he'd not be likely to stumble upon her.
Did you anywhere, kennel, on your gullible's travels or during your rural troubadouring, happen to stumble upon a certain gay young nobleman whimpering to the name of Low Swine who always addresses women out of the one comer of his mouth, lives on loans and is furtivefree yours of age?