stumble upon
Intermediate (B1)neutral
Find something by accident when you weren't looking for it.
"While browsing a second-hand bookshop, he stumbled upon a first edition signed by the author."
Hear it in context

alone in new york (but not lonely)
Sydney Serena · 2:52
So, I did stumble upon this.

10 Stoic Principles So That NOTHING Can AFFECT YOU | Epictetus Stoicism (2026)
Stoic Journal · 3:58
purpose is not something you stumble upon

The World Design of Hollow Knight: Silksong
Game Maker's Toolkit · 20:22
it gives those who do stumble upon

Lindsay Clancy & the 13 Medications Prescribed to Her: 48 Hours of No Sleep After New Med
Rotten Mango · 0:33
you could always stumble upon a post asking,

Joe Rogan Experience #2488 - James McCann
PowerfulJRE · 10:09
Like it's stumble upon success after success.