blunder upon

He can't get right if he tries—and if he does blunder upon it, he can't stay right six months, let him do his best—morally impossible!

Finally, after piling blunder upon blunder for four months, the public relations team at got something right.

Sometimes they vary their programme by prowling blindly through the woods, singly or in pairs, trusting to luck to blunder upon their game; for they are wretched hunters.

The board system is well adapted to secure deliberation, but not promptness and unity of action nor responsibility, because one member may easily shift the responsibility for an error or blunder upon his colleagues.

In the second act, Marjery commits blunder upon blunder.