A clumsy or embarrassing mistake. / (chess) A very bad move, usually caused by some tactical oversight.

(intransitive) To make a clumsy or stupid mistake. / (intransitive) To move blindly or clumsily. / (transitive) To cause to make a mistake.

The act of making a blunder.

present participle of blunder

plural of blundering

plural of blunder

Third-person singular simple present indicative form of blunder

Prone to make blunders.

plural of blunderer

One who blunders.