| Others find the process to be one of trial and error, until they stumble upon one that fits. |
| If scientists were working hard on behalf of athletes to boost their performance in this way, who knows what discoveries they might stumble upon. |
| With every passing phase, life becomes more complex in the sense that it allows man to either stumble upon or to consciously discover new phenomena and substance. |
| If you slip away from the main tourist scene, you'll likely stumble upon a bakery offering freshly baked brown loaves from 200-year-old recipes. |
| For a professional explorer to stumble upon such uncharted territory can be very chastening. |
| The band has one guy steady on the traps and two more on pan-knockers, so they can't help but stumble upon the occasional sweet beat. |
