The Acostas, like many of the storm victims, simply stumbled onto them.

Some simply stumbled to a stop and refused to move anymore.

As if the boy simply stumbled upon them.

It seemed unlikely that they could have simply stumbled across the lair.

I simply stumbled upon a new way to discuss some very common teen issues.

Well, I wouldn't rule that out, but it's more likely that the man simply stumbled onto things.

It is not a discovery anyone would simply stumble upon.

The main point is that you simply stumbled on the scene, went into panic, and had the scare of your life.

Are there any more "basic principles" in him - principles we simply never stumbled on before - just waiting for the right stimulus?

Trent didn't seem surprised when I didn't fall but simply stumbled back, my impulse to flee coming far too late.