n. & v.
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. blunderer n. blunderingly adv.
[ ME prob. f. Scand.: cf. MSw blundra shut the eyes ]