In chess, a blunder is a critically bad move. It is usually caused by some tactical oversight, whether it be from time trouble, overconfidence or carelessness. Although blunders are more common in amateur games, all players make them, even at the world championship level.

What is an example of a blunder?

Blunder means to say or do something in a careless or stupid way. An example of blunder is someone tripping over their own foot. To make a mistake in; botch. Would-be thieves blundering a break-in.

What does blunder mean in slang?

a gross, stupid, or careless mistake: That's your second blunder this morning.