blunder (blunders plural & 3rd person present) (blundering present participle) (blundered past tense & past participle )
1 n-count A blunder is a stupid or careless mistake.
I think he made a tactical blunder by announcing it so far ahead of time.
2 verb If you blunder, you make a stupid or careless mistake.
No doubt I had blundered again... V
3 verb If you blunder into a dangerous or difficult situation, you get involved in it by mistake.
People wanted to know how they had blundered into war, and how to avoid it in future. V into n
4 verb If you blunder somewhere, you move there in a clumsy and careless way.
He had blundered into the table, upsetting the flowers. V prep/adv