—n. a clumsy or foolish mistake, esp. an important one.
—v.
1 intr. make a blunder; act clumsily or ineptly.
2 tr. deal incompetently with; mismanage.
3 intr. move about blindly or clumsily; stumble.
Derivatives:
blunderer n. blunderingly adv.
Etymology: ME prob. f. Scand.: cf. MSw blundra shut the eyes
Useful english dictionary. 2012.