intransitive verb

1. to move clumsily or carelessly; flounder; stumble
2. to make a foolish or stupid mistake

Etymology: ME blunderen, freq. < ON blunda, to shut the eyes, akin to Swed dial. blundra, to do blindly < IE base *bhlendh-: see blend

transitive verb

1. to say stupidly, clumsily, or confusedly; blurt: often with out
2. to do clumsily or poorly; bungle

noun