blunder upon

He can blunder upon the latitude with the aid of an old quadrant, but he leaves his longitude to dead reckoning.'

It was a light iron structure (perhaps a Tay blunder upon a small scale).

Charlotte flew at Ernest immediately, and laid all the blame of the blunder upon his shoulders.

It makes an apt preparation for the far more serious blunder upon which the main part of the action turns.

Of course, if he set out with such an error he will accumulate blunder upon blunder.